Relevant bibliographies by topics / Manganiti

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
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Academic literature on the topic 'Manganiti'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 March 2023

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Journal articles on the topic "Manganiti"

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Anand A., Manjuladevi M., Veena R. K., Veena V.S., and Sagar S. "The Influence of Ti Doping at the Mn Site on Magnetoresistance and Thermopower Properties of Nd-=SUB=-0.5-=/SUB=-Ca-=SUB=-0.5-=/SUB=-MnO-=SUB=-3-=/SUB=-." Physics of the Solid State 64, no. 6 (2022): 686. http://dx.doi.org/10.21883/pss.2022.06.54371.001.

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Nd-Ca-based manganite Nd0.5Ca0.5MnO3 and 10% Ti-doped manganite Nd0.5Ca0.5Ti0.1Mn0.9O3 denoted by N and N0.1, respectively, were prepared using solid-state reaction method. Resistivity gets increased for the Ti-doped sample. The parent compound N has remarkably high magnetoresistance. The highest value of Seebeck coefficient for N is -97 μVK-1 at 143 K and for N0.1 is -207 μVK-1 at 203 K. Variable range hopping mechanism successfully explains the high temperature resistivity and thermopower data. Keywords: magnetoresistance, thermoelectric power, rare-earth based manganites, manganites.
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Przybytek, Jacek, Vladimir Markovich, and Grzegorz Jung. "Meyer-Neldel rule in the conductivity of phase separated manganites." Journal of Electrical Engineering 70, no. 7 (December 1, 2019): 65–70. http://dx.doi.org/10.2478/jee-2019-0043.

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Abstract Meyer-Neldel behaviour of the conductivity of phase separated La1−xCaxMnO3 manganite system in the low Ca-doping range has been investigated. Evolution of the isokinetic temperature of the conductivity, modified by Ca-doping, hydrostatic pressure and current bias has been determined. In addition, the evolution of the isokinetic temperature with ageing has also been studied. It is found that the Meyer-Neldel behaviour of the manganite system stems from multi-excitation entropy mechanism. The isokinetic temperatures estimated from pressure and doping effects coincide but differ from those determined using current and ageing controlled conductivity changes. It is concluded that in the presence of a detailed theoretical model of the excitations coupling in manganites, the investigations of the Meyer-Neldel effect may became a powerful tool for characterization and investigation of transport mechanisms in phase separated manganites.
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EGILMEZ, M., K. H. CHOW, and J. A. JUNG. "ANISOTROPIC MAGNETORESISTANCE IN PEROVSKITE MANGANITES." Modern Physics Letters B 25, no. 10 (April 20, 2011): 697–722. http://dx.doi.org/10.1142/s0217984911026176.

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We have summarized some important results of the anisotropic transport properties of the prototypical manganite La 1-x Ca x MnO 3 as well as a few others. The temperature dependence of anisotropic magnetoresistance in manganites exhibits a peak near the magnetic ordering temperature which differs dramatically from the ones in 3d ferromagnetic metals and alloys. Depending on the strain-driven orbital state, the AMR in manganites could be enhanced dramatically. The AMR in manganites is much larger than in ferromagnetic metals, where its magnitude is only of the order of a few percent. At low fields (below few kG) the intrinsic magnetocrystalline anisotropy becomes important and the dependence of resistance on angle changes to a more switching-like behavior. The magnitude of the switching is sufficiently large such that this phenomenon could be useful in spintronics for magnetic field sensing and nonvolatile memory applications. Moreover, at temperatures far below the metal insulator transition temperatures, the AMR in LCMO/LAO also flips and changes a sign in contrast to LCMO/STO films. Also sign flip takes place in charge and orbital ordered manganites exhibiting field induced ferromagnetism. Polycrystalline manganite samples also exhibit strong AMR. At lower temperatures the dependence of the AMR on temperature is dramatically different in polycrystalline samples than the epitaxial or single crystal samples. The behavior in the the polycrystalline samples could be governed by spin-polarized transport across the grain boundaries.
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Taldenkov, A. N., N. A. Babushkina, A. V. Inyushkin, V. S. Kalitka, and A. R. Kaul. "Oxygen Isotope Effect in Ordered PrBaMn2O6." Solid State Phenomena 190 (June 2012): 699–702. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.699.

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The oxygen isotope effect in ordered half-doped manganite PrBaMn216-18O6 has been investigated. Real and imaginary parts of ac magnetic susceptibility, dc magnetization and magnetoresistance were measured at temperatures from 4.2 to 320 K in applied magnetic field up to 35 kOe. Substantial increase of charge ordering (CO) transition temperature TCO under oxygen isotope substitution 16O 18O and small decrease of ferromagnetic (FM) transition temperature TFM were found. Small systematic shift of ferromagnetic transition temperature in oxygen reduced manganite PrBaMn216 18O5 is also considered. The obtained results are compared with those observed in other manganites demonstrating the large isotope effect.
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Botello-Zubiate, María, María Grijalva-Castillo, Daniel Soto-Parra, Renee Sáenz-Hernández, Carlos Santillán-Rodríguez, and José Matutes-Aquino. "Preparation of La0.7Ca0.3−xSrxMnO3 Manganites by Four Synthesis Methods and Their Influence on the Magnetic Properties and Relative Cooling Power." Materials 12, no. 2 (January 19, 2019): 309. http://dx.doi.org/10.3390/ma12020309.

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Manganites of the family La0.7Ca0.3−xSrxMnO3 were fabricated by four preparation methods: (a) the microwave-assisted sol-gel Pechini method; (b) sol-gel Pechini chemical synthesis; (c) solid-state reaction with a planetary mill; and (d) solid-state reaction with an attritor mill, in order to study the effect of the preparation route used on its magnetocaloric and magnetic properties. In addition, the manganites manufactured by the Pechini sol-gel method were compacted using Spark Plasma Sintering (SPS) to determine how the consolidation process influences its magnetocaloric properties. The Curie temperatures of manganites prepared by the different methods were determined in ~295 K, with the exception of those prepared by a solid-state reaction with an attritor mill which was 301 K, so there is no correlation between the particle size and the Curie temperature. All samples gave a positive slope in the Arrot plots, which implies that the samples underwent a second order Ferromagnetic (FM)–Paramagnetic (PM) phase transition. Pechini sol-gel manganite presents higher values of Relative Cooling Power (RCP) than the solid-state reaction manganite, because its entropy change curves are smaller, but wider, associated to the particle size obtained by the preparation method. The SPS technique proved to be easier and faster in producing consolidated solids for applications in active magnetic regenerative refrigeration compared with other compaction methods.
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Yurasov, A. N., T. N. Bakhvalova, A. V. Telegin, Yu P. Sukhorukov, and A. B. Granovsky. "The Analysis of the Magnetorefractive Effect in La 0.7Ca0.3Mno3: Thin Films and Single Crystals." Solid State Phenomena 190 (June 2012): 381–84. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.381.

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Recently, it has been shown that the magnetorefractive effect in reflection and transmission modes in La0.7Ca0.3MnO3 manganite thin films and single crystals can reach several percents for single crystals and up to 20-40% for thin films in the middle infrared spectral range near the Curie temperature. In the present paper, to explain these data we used the effective medium approach and supposed that La 0.7Ca 0.3MnO3 manganites consist of low and high resistivity phases with volume fractions depending on an applied magnetic field. It is shown that the magnetorefractive effect spectra strongly depend on magnetoresistance and optical properties of manganites in the infrared range.
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Nikitin, Stanislav, Sergey Popkov, Mikhail Petrov, Konstantin Terent’ev, Sergey Semenov, and Kirill Shaikhutdinov. "Features Of Magnetoresistance In The Bilayer Single Crystal Manganite LA1.4SR1.6MN2O7." Siberian Journal of Physics 10, no. 1 (March 1, 2015): 63–66. http://dx.doi.org/10.54362/1818-7919-2015-10-1-63-66.

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We investigate magnetoresistance of single-crystal bilayer lanthanum manganite La1.4Sr1.6Mn2O7 at a transport current flowing along the crystal c axis and in external magnetic fields applied parallel to the crystal c axis or ab plane. It is demonstrated that the La1.4Sr1.6Mn2O7 manganite exhibits the positive magnetoresistance effect in the magnetic field applied in the ab plane of the sample at the temperatures T < 60 K. The mechanism of this effect is shown to be fundamentally different from the colossal magnetoresistance effect typical of lanthanum manganites. The positive magnetoresistance originates from spin-dependent tunneling of carriers between the manganese-oxygen bilayers and can be explained by features of the magnetic structure of the investigated compounds.
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Miao, Tian, Lina Deng, Wenting Yang, Jinyang Ni, Changlin Zheng, Joanne Etheridge, Shasha Wang, et al. "Direct experimental evidence of physical origin of electronic phase separation in manganites." Proceedings of the National Academy of Sciences 117, no. 13 (March 16, 2020): 7090–94. http://dx.doi.org/10.1073/pnas.1920502117.

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Electronic phase separation in complex oxides is the inhomogeneous spatial distribution of electronic phases, involving length scales much larger than those of structural defects or nonuniform distribution of chemical dopants. While experimental efforts focused on phase separation and established its correlation with nonlinear responses under external stimuli, it remains controversial whether phase separation requires quenched disorder for its realization. Early theory predicted that if perfectly “clean” samples could be grown, both phase separation and nonlinearities would be replaced by a bicritical-like phase diagram. Here, using a layer-by-layer superlattice growth technique we fabricate a fully chemically ordered “tricolor” manganite superlattice, and compare its properties with those of isovalent alloyed manganite films. Remarkably, the fully ordered manganite does not exhibit phase separation, while its presence is pronounced in the alloy. This suggests that chemical-doping-induced disorder is crucial to stabilize the potentially useful nonlinear responses of manganites, as theory predicted.
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Wu, Dan, Wei Li, O. Tegus, and Si Qin Bater. "Study on Modified High Voltage (5V) Spinel Lithium Manganate Used for Energy Storage Lithium Titanate Batteries." Solid State Phenomena 310 (September 2020): 58–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.310.58.

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Solid electrolyte Li1.4Al0.4Ti1.6 (PO4)3 was used to coat high voltage (5V) spinel lithium manganate. The modified high voltage spinel lithium manganate was used as positive electrode and the lithium titanate as negative electrode. A type of 10Ah energy storage battery was assembled. Charge-discharge and cycle life tests of these batteries were carried out at different temperatures and rates. The results show that coating high voltage spinel lithium manganate improves the high temperature cycle performance of the lithium titanate batteries. The capacity retention ratio of the lithium titanate batteries with the coated high voltage lithium manganate as cathode material increases from 74.8% to 86.5% at 60°Cafter 2000 cycles compared to the lithium titanate batteries with the uncoated high voltage lithium manganite as cathode material. However, the cycle performance is not affected at-30 °C. The low temperature rate performance of lithium titanate batteries is improved by coating high voltage lithium manganate. When the discharge rate is 20 C at-30°C, 90.6% of the 1 C charge capacity at room temperature of the lithium titanate battery with the coated high voltage lithium manganate as cathode materialcan be delivered, while the lithium titanate battery with the un-coated high voltage lithium manganate as cathode material can only deliver 80.2% of the 1 C charge capacity at room temperature.
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De Sousa, P., N. Panwar, I. Bdikin, A. L. Kholkin, C. M. Fernandes, and A. M. R. Senos. "Effect of the Grain Size on the Magnetic Phase Separation in La0.8Sr0.2MnO3 by Magnetic Force Microscopy." Microscopy and Microanalysis 18, S5 (August 2012): 101–2. http://dx.doi.org/10.1017/s1431927612013165.

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Perovskite manganites have been the focus of worldwide research during the last two decades because of the observation of colossal magnetoresistance (CMR) effect. These materials have potential applications in magnetic field sensors, spin filters, infrared bolometers and cathodes for solid oxide fuel cells. Such manganites are also important from the fundamental study viewpoint as they offer interplay among various degrees of freedom viz. spin, lattice and charge ordering. Moreover, phase separation may occur in manganites with low concentration of the dopant. In such scenario, ferromagnetic metallic clusters are embedded in antiferromagnetic insulating matrix. The fraction of these magnetic phases may vary from the nano- to micro-scale. With higher dopant concentration, the percolation of these magnetic metallic clusters leads to the apparent CMR effect. In this study we focus our attention to the low doped La0.8Sr0.2MnO3 (LSMO) manganite and investigate the possible magnetic phase separation and effect of variation in grain size on the magnetic domain size. La0.8Sr0.2MnO3 possesses Curie temperature (TC) higher than room temperature, therefore the material is supposed to be in the magnetic state at room temperature.
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Dissertations / Theses on the topic "Manganiti"

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Fugattini, Silvio. "Studio mediante magnetometro moke di film sottili di manganite per applicazioni in spintronica." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8334/.

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In questo lavoro di tesi è stata studiata l'anisotropia magnetica di film sottili epitassiali di La0.7Sr0.3MnO3 (LSMO), cresciuti con la tecnica Channel Spark Ablation su substrati monocristallini di SrTiO3 (001). L'interesse nei confronti di questi materiali nasce dal fatto che, grazie alla loro proprietà di half-metallicity, sono usati come iniettori di spin in dispositivi per applicazioni in spintronica, l'elettronica che considera elemento attivo per l'informazione non solo la carica elettrica ma anche lo spin dei portatori. Un tipico esempio di dispositivo spintronico è la valvola di spin (un dispositivo costituito da due film ferromagnetici metallici separati da uno strato conduttore o isolante) il cui stato resistivo dipende dall'orientazione relativa dei vettori magnetizzazione (parallela o antiparallela) degli strati ferromagnetici. E’ quindi di fondamentale importanza conoscere i meccanismi di magnetizzazione dei film che fungono da iniettori di spin. Questa indagine è stata effettuata misurando cicli di isteresi magnetica grazie ad un magnetometro MOKE (magneto-optical Kerr effect). Le misure di campo coercitivo e della magnetizzazione di rimanenza al variare dell'orientazione del campo rispetto al campione, permettono di identificare l'anisotropia, cioè gli assi di facile e difficile magnetizzazione. I risultati delle misure indicano una diversa anisotropia in funzione dello spessore del film: anisotropia biassiale (cioè con due assi facili di magnetizzazione) per film spessi 40 nm e uniassiale (un asse facile) per film spessi 20 nm. L'anisotropia biassiale viene associata allo strain che il substrato cristallino induce nel piano del film, mentre l'origine dell'uniassialità trova la giustificazione più probabile nella morfologia del substrato, in particolare nella presenza di terrazzamenti che potrebbero indurre una step-induced anisotropy. Il contributo di questi fattori di anisotropia alla magnetizzazione è stato studiato anche in temperatura.
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MUSCAS, GIUSEPPE. "Tuning the magnetic anisotropy in nanostructured magnetic oxides." Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266794.

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Among nanostructured magnetic materials, nanoparticles (NPs) are unique complex physical objects: in these systems a multidomain organization is energetically unfavorable and single-magnetic-domain particles are formed, each one with a huge magnetic moment with comparison to that of single atoms, thus they are often named “supermoment”. The attractive performance of magnetic NPs based materials are appealing for several technological fields ranging from nanomedicine to high-density magneto recording. Thus, understanding the physics of magnetic nanoparticles and controlling their magnetic properties represent hot topics not only for fundamental studies but also for technological applications. The magnetic behavior of such entities is related to the reversal of their magnetization; this can be a thermal or a field activated transition, which is characterized by an energy barrier defined as a magnetic anisotropy energy (MAE), which is influenced by several parameters. Thus, the tuning of the magnetic properties of nanoparticles means control of the MAE. In this work it will be discussed how to tune the MAE at the nanoscale showing the main parameters that can influence the anisotropy itself. It will be investigated the role of particle volume in the effective anisotropy, and its correlation with the surface contribution, exploring its strong effect with particle size below 10 nm. In this framework it will be investigated the role of organic coating, underlining its ability to reduce the magnetic disorder arising from the broken symmetry at particles surface. In addition, in nanoparticle ensemble, the MAE may differ from one particle to another due to particles size and shape distributions. Thus it will be defined a detailed statistical analysis of particles’ morphology, leading to the development of a new instrument to analyze particles morphology, called “aspect maps”. The relation between the physical chemical structures of nanoparticles will be investigated on nickel doped cobalt ferrite samples, demonstrating how to tune the MAE by chemical composition, i.e., controlling magnetocrystalline anisotropy. Furthermore it will be analyzed the evolution of interparticles interactions with respect single particle magnetic anisotropy by means of a modified random anisotropy model. The last part of this work will deal with the design of novel nanostructured composites. La0.67Ca0.33MnO3 and CoFe2O4 will be combined using two different structures, which can be easily extent to other materials, to improve their magnetic interactions in order to obtain tunable magnetotrasport proprieties of the final composites.
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Kavaliauskas, Žydrūnas. "Plonųjų manganitų sluoksnių sąveikos su mikrobange spinduliuote tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20060616_172158-61020.

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In this work the experimental resuls of the investigation of microwave response of textured LCMO films are presented. It is shown that microwave pulse induced dc resistance response is an agreement with the temperature derivative of the film resistance.
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Geck, Jochen. "Spins, charges, and orbitals in perovskite manganites : resonant and hard x-ray scattering studies /." Berlin : Mensch & Buch Verl, 2004. http://www.loc.gov/catdir/toc/fy0804/2007464041.html.

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Sousa, Afrânio Manoel de. "Simulação atomística das manganitas h-RMnO3 (R = Er, Tm, Yb, Lu, In e Sc) puras e dopadas com metais de transição e terras raras." Pós-Graduação em Física, 2018. http://ri.ufs.br/jspui/handle/riufs/8986.

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Fundação de Apoio a Pesquisa e à Inovação Tecnológica do Estado de Sergipe - FAPITEC/SE
In this work, we studied the h-RMnO3 (R = Er, Tm, Yb, Lu, In and Sc) manganites which are materials with important multiferroic properties. The classical atomistic simulation was used in order to obtain a set of interatomic potentials that describe the structural properties of manganite family in ferroelectric phase (FE). The structural properties such as the lattice parameters, the unit cell volume and the interatomic distances were investigated and compared with results of the literature. The influence of chemical pressure on the structural properties of these compounds was analyzed. It was observed that the lattice parameters (a and c) and the volume of the unit cell increase as the ionic radius of the R3+ ion increases. All h-RMnO3 manganites were studied under hydrostatic pressure up to 40 GPa. It was observed that the lattice parameters (a and c) and the unit cell volume decrease with an increase in the hydrostatic pressure. The paraelectric phase (PE) was studied using the interatomic potential developed in the ferroelectric phase. Thus, the structural properties in this phase were obtained and compared with the literature. Effects of doping of trivalent ions on the h-LuMnO3 manganite were studied in three crystallographic sites (Mn, Lu1 and Lu2). Solution energy was calculated for all dopants (Al, Cr, Ga, Fe, Sc, Yb, Er, Y, Ho, Gd, Eu, Sm, Nd e La) and the results showed that the Mn site has the lowest solution energy, therefore, the Mn site is energetically more favorable. The metals (Al, Cr, Ga, Fe) dopants proved to be more favorable to incorporate at the Mn site than rare earths ones (Sc, Yb, Er, Y, Ho, Gd, Eu, Sm, Nd and La), but at the Lu site the rare earths are energetically more favorable to incorporate. The calculated interatomic distances at the Mn site decreases when doping with metal (Al, Cr, Ga and Fe). However, these distances increase when doping is done with rare earth (Sc, Yb, Er, Y, Ho, Gd, Eu, Sm, Nd and La). In addition, important ferroelectric distortion properties were evaluated due the change in the tilting angle of the MnO5 bipyramid. The tilting angle increases in the pure system if the doping is done with metals (Al, Cr, Ga, Fe) for all sites. On the other hand, the tilting angle decreases with rare earth ions incorporation at the Mn and Lu1 sites and increases in the rare earths doping at the Lu2 site.
Estuda-se neste trabalho as manganitas h-RMnO3 (R = Er, Tm, Yb, Lu, In e Sc), que são materiais que apresentam importantes propriedades multiferroicas. A simulação atomística clássica foi usada com o objetivo de obter um conjunto de potenciais interatômicos que descrevam as propriedades estruturais da família de manganitas na fase ferroelétrica (FE). As propriedades estruturais como os parâmetros de rede, o volume da célula unitária e as distâncias interatômicas foram investigadas e comparadas com a literatura. Em vista disso, a influência da pressão química nessas propriedades estruturais foi analisada. Observou-se que os parâmetros de rede (a e c) e o volume da célula unitária aumentam à medida que o raio iônico do íon R3+ aumenta. Todas as manganitas h-RMnO3 foram submetidas a uma pressão hidrostática de até 40 GPa. Verificou-se que houve uma redução nos parâmetros de rede (a e c) e no volume da célula unitária à medida que a pressão hidrostática aumenta. A fase paraelétrica (PE) foi estudada utilizando os potenciais interatômicos desenvolvidos na fase ferroelétrica. Com isso, as propriedades estruturais nessa fase foram obtidas e comparadas com a literatura. O efeito da dopagem com íons trivalentes foi estudado em três sítios cristalográficos (Mn, Lu1 e Lu2) da manganitas h-LuMnO3. A energia de solução foi calculada para todos os dopantes (Al, Cr, Ga, Fe, Sc, Yb, Er, Y, Ho, Gd, Eu, Sm, Nd e La) e os resultados mostraram que o sítio do Mn possui a menor energia de solução, portanto, esse é o sítio energeticamente mais favorável. Diante disso, os metais (Al, Cr, Ga, Fe) se mostraram energeticamente mais favoráveis que os terras raras (Sc, Yb, Er, Y, Ho, Gd, Eu, Sm, Nd e La) no sítio do Mn, porém nos sítios do Lu1 e Lu2 os terras raras são mais favoráveis de serem incorporados. As distâncias interatômicas calculadas no sítio do Mn diminuem após a dopagem com os metais (Al, Cr, Ga e Fe), enquanto que essas distâncias aumentam quando a dopagem é realizada com os terras raras (Sc, Yb, Er, Y, Ho, Gd, Eu, Sm, Nd e La). Além disso, os efeito da dopagem na distorção ferroelétrica foram avaliadas com a mudança no ângulo de tilting da bipirâmide MnO5. Um aumento do ângulo de tilting em relação ao sistema puro é obtido quando a dopagem é realizada com metais (Al, Cr, Ga, Fe) para todos os sítios estudados. Por outro lado, o ângulo de tilting decresce quando ocorre a incorporação de íons terras raras nos sítios do Mn e Lu1, mas aumenta quando a dopagem dos terras raras é realizada no sítio do Lu2.
São Cristóvão, SE
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Devenson, Jelena. "Įvairialyčių lantano manganitų sandūrų gaminimas ir tyrimas." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20091008_155458-83885.

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Disertacijoje nagrinėjamos įvairios galimybės panaudoti feromagnetinių oksidų – manganitų sluoksnius bei jų darinius naujų spintronikos prietaisų gaminimui. Šio darbo pagrindiniu tyrimo objektu pasirinktos sandūros, sudarytos tarp dvivalenčiais (Ca, Ba, Sr) ir keturvalenčiais (Ce) jonais legiruotų lantano mangano oksidų plonųjų sluoksnių, o taip pat tarp manganitų ir elektroninio laidumo SrTiO3 (STON) bei n - Si padėklų. Darbe pateiktas išsamus minėtų manganitų sluoksnių ir jų darinių gaminimo magnetroninio dulkinimo ir impulsinio lazerinio garinimo būdais aprašymas. Disertacijoje pateikti plonųjų manganitų sluoksnių, užaugintų ant skirtingų padėklų, kristalinės struktūros bei paviršiaus kokybės tyrimo duomenys, aprašytas magnetiniu lauku valdomų diodinių darinių formavimas, jų elektrinių bei magnetinių savybių tyrimai, įvertinti svarbiausi atskirų manganitų sluoksnių bei jų diodinių darinių elektrofiziniai parametrai. Atlikus kompleksinius keturvalenčiais Ce4+ jonais legiruotų lantano manganito sluoksnių kristalinės sandaros bei elektrinių savybių tyrimus nustatyta, kad šie sluoksniai pasižymi ne elektroniniu, kaip buvo skelbta anksčiau, o skyliniu elektriniu laidumu. Skylinis junginio elektrinis laidumas paaiškintas nežymiu šalutinės CeO2 fazės ir katijonų vakansijų susidarymu auginamuose sluoksniuose. Pateikti Ca, Ba, Sr ir Ce jonais legiruotų manganitų įvairialyčių darinių palyginamieji tyrimai, įvertinta padėklo įtaką kristalinės manganitų sandaros tobulumui... [toliau žr. visą tekstą]
In this dissertation application of the lanthanum manganite films and their heterostructures for fabrication of new spintronic devices is discussed. The main subjects of this work are the junctions between lanthanum manganite oxide thin films doped by divalent (Ca, Ba, Sr) and tetravalent (Ce) ions as well heterojunctions formed between lanthanum manganites and n-type SrTiO3 (STON) or n - Si substrates. The influence of doping and substrate influence on crystalline quality of manganite film structures, interface roughness as well as their electrical and magnetic properties has been estimated in this dissertation. After performing complex investigations it has been determined that tetravalent Ce ion doped lanthanum manganite films have not the electron but hole-type conductivity on the contrary to that has been reported earlier. Forming of magnetic filed dependent “manganite / (STON, n - Si)“ diode structures has been described, comparative studies of electrical and magnetic properties have been presented, and major electro-physical parameters have been estimated in this work. Possible reasons of the origin of positive and negative magnetoresistance have been pointed out. In addition, structural stabilization problems of BiFeO3 compound, exhibiting at the same time magnetic as well as ferroelectric properties and possibilities of application of its unique properties in various lanthanum manganite structures for the development of new magnetic and electrical filed... [to full text]
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7

Devenson, Jelena. "Fabrication and investigation of heterostructures based on lanthanum manganites." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20091008_155508-20318.

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In this dissertation application of the lanthanum manganite films and their heterostructures for fabrication of new spintronic devices is discussed. The main subjects of this work are the junctions between lanthanum manganite oxide thin films doped by divalent (Ca, Ba, Sr) and tetravalent (Ce) ions as well heterojunctions formed between lanthanum manganites and n-type SrTiO3 (STON) or n - Si substrates. The influence of doping and substrate influence on crystalline quality of manganite film structures, interface roughness as well as their electrical and magnetic properties has been estimated in this dissertation. After performing complex investigations it has been determined that tetravalent Ce ion doped lanthanum manganite films have not the electron but hole-type conductivity on the contrary to that has been reported earlier. Forming of magnetic filed dependent “manganite / (STON, n - Si)“ diode structures has been described, comparative studies of electrical and magnetic properties have been presented, and major electro-physical parameters have been estimated in this work. Possible reasons of the origin of positive and negative magnetoresistance have been pointed out. In addition, structural stabilization problems of BiFeO3 compound, exhibiting at the same time magnetic as well as ferroelectric properties and possibilities of application of its unique properties in various lanthanum manganite structures for the development of new magnetic and electrical filed... [to full text]
Disertacijoje nagrinėjamos įvairios galimybės panaudoti feromagnetinių oksidų – manganitų sluoksnius bei jų darinius naujų spintronikos prietaisų gaminimui. Šio darbo pagrindiniu tyrimo objektu pasirinktos sandūros, sudarytos tarp dvivalenčiais (Ca, Ba, Sr) ir keturvalenčiais (Ce) jonais legiruotų lantano mangano oksidų plonųjų sluoksnių, o taip pat tarp manganitų ir elektroninio laidumo SrTiO3 (STON) bei n - Si padėklų. Darbe pateiktas išsamus minėtų manganitų sluoksnių ir jų darinių gaminimo magnetroninio dulkinimo ir impulsinio lazerinio garinimo būdais aprašymas. Disertacijoje pateikti plonųjų manganitų sluoksnių, užaugintų ant skirtingų padėklų, kristalinės struktūros bei paviršiaus kokybės tyrimo duomenys, aprašytas magnetiniu lauku valdomų diodinių darinių formavimas, jų elektrinių bei magnetinių savybių tyrimai, įvertinti svarbiausi atskirų manganitų sluoksnių bei jų diodinių darinių elektrofiziniai parametrai. Atlikus kompleksinius keturvalenčiais Ce4+ jonais legiruotų lantano manganito sluoksnių kristalinės sandaros bei elektrinių savybių tyrimus nustatyta, kad šie sluoksniai pasižymi ne elektroniniu, kaip buvo skelbta anksčiau, o skyliniu elektriniu laidumu. Skylinis junginio elektrinis laidumas paaiškintas nežymiu šalutinės CeO2 fazės ir katijonų vakansijų susidarymu auginamuose sluoksniuose. Pateikti Ca, Ba, Sr ir Ce jonais legiruotų manganitų įvairialyčių darinių palyginamieji tyrimai, įvertinta padėklo įtaką kristalinės manganitų sandaros tobulumui... [toliau žr. visą tekstą]
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Girkantaitė, Rasa. "ErMnO3 monokristalo optinių savybių tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080924_184014-24660.

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Tirta ErMnO3 optinės savybės: apskaičiuotos dielektrinių skvarbų spektrinės priklausomybės, optinių šuolių energijos, lūžio ir sugerties rodikliai. Tyrimai atlikti elipsometru, dielektrinė funkcija apskaičiuojama pagal vienašio kristalo modelį.
Manganites have attracted a lot of attention due to their magnetical properties: colossal magnetoresistance, variety of phase, but the optical properties of ErMnO3 were not widely investigated. Investigation of optical properties of ErMnO3 single crystal were studie by means of ellipsometry method. Ellipsometric studies have been carried out in the spectral range of 1- 5 eV. The photimetric ellipsometer with rotating analyzer was used. Experimental ellipsometer data were analysed in the isotropical and uniaxial crystal models. The optical properties of ErMnO3 were investigated: ellipsometric parameters Ψ and Δ were determinated, the components of dielectric function and energy of optical transition were found, calculated refractive and absorption indexs.
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Coutinho, Waldeck Sotero. "Um estudo de primeiros princípios sobre a origem e os mecanismos da ferroeletricidade nos compostos multiferróicos RMnO3 (R=Y, Lu)." Universidade Federal de Sergipe, 2016. https://ri.ufs.br/handle/riufs/5249.

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Fundação de Apoio a Pesquisa e à Inovação Tecnológica do Estado de Sergipe - FAPITEC/SE
The RMnO3 (R=Y,Lu) compounds, members of the family of hexagonal manganites, are materials which exhibit strong magneto-electric coupling characteristic for multiferroic compounds. Despite the numerous studies with objective to reveal the origin of this phenomenon, the mechanism that is causing it is still not fully understood. The question that attracts special attention of scientific community is about the cause of ferroelectric distortion that occurs at certain temperatures in these materials. Although this issue is discussed in many papers, there is still no consensus what mechanism is responsible for it: (1) hybridization between the Mn dz2 orbital and O pz orbital (Mn d0 –ness model), (2) hybridization between the R dz2 orbital and O pz orbital (R d0 –ness model), (3) geometric effects or (4) charge transfer from Mn-O bonds to R-O bonds. Understanding of the mechanism that leads to ferroelectric polarization is necessary to speed application of these materials in ferroelectric memories or spintronics devices. Objective of the present work was to evaluate the first two possible mechanisms that might cause the ferroelectric distortion in RMnO3. Adopted strategy was to investigate what happens with the Mn-O and R-O chemical bonds after the structural phase transition from paraelectric to ferroelectric phase that occurs at high temperature, at which both phases are characterized by paramagnetic order of the Mn magnetic moments. For that purpose, the first-principles calculations based on density functional theory were carried on, with usage of the most modern exchange-correlation potentials. The chemical bonds were evaluated (1) qualitatively, by analysis of density of electronic states (DOS) and maps of electronic density along the bonds, and (2) quantitatively, in terms of topological analysis of Bader. The results revealed that no significant change occurred with Mn-O bonds, while the R-O bonds were affected by phase transition in the sense that R dz2 and O pz orbital exhibited enhanced hybridization in the ferroelectric phase. Therefore, the present study substantiates the R d0 –ness mechanism as the probable cause of ferroelectric distortions in RMnO3 compounds.
The RMnO3 (R=Y,Lu) compounds, members of the family of hexagonal manganites, are materials which exhibit strong magneto-electric coupling characteristic for multiferroic compounds. Despite the numerous studies with objective to reveal the origin of this phenomenon, the mechanism that is causing it is still not fully understood. The question that attracts special attention of scientific community is about the cause of ferroelectric distortion that occurs at certain temperatures in these materials. Although this issue is discussed in many papers, there is still no consensus what mechanism is responsible for it: (1) hybridization between the Mn dz2 orbital and O pz orbital (Mn d0 –ness model), (2) hybridization between the R dz2 orbital and O pz orbital (R d0 –ness model), (3) geometric effects or (4) charge transfer from Mn-O bonds to R-O bonds. Understanding of the mechanism that leads to ferroelectric polarization is necessary to speed application of these materials in ferroelectric memories or spintronics devices. Objective of the present work was to evaluate the first two possible mechanisms that might cause the ferroelectric distortion in RMnO3. Adopted strategy was to investigate what happens with the Mn-O and R-O chemical bonds after the structural phase transition from paraelectric to ferroelectric phase that occurs at high temperature, at which both phases are characterized by paramagnetic order of the Mn magnetic moments. For that purpose, the first-principles calculations based on density functional theory were carried on, with usage of the most modern exchange-correlation potentials. The chemical bonds were evaluated (1) qualitatively, by analysis of density of electronic states (DOS) and maps of electronic density along the bonds, and (2) quantitatively, in terms of topological analysis of Bader. The results revealed that no significant change occurred with Mn-O bonds, while the R-O bonds were affected by phase transition in the sense that R dz2 and O pz orbital exhibited enhanced hybridization in the ferroelectric phase. Therefore, the present study substantiates the R d0 –ness mechanism as the probable cause of ferroelectric distortions in RMnO3 compounds.
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Každailis, Paulius. "Nuotėkio akustinės bangos akustooptinėje ir akustoelektrinėje sąveikoje." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120426_160847-29495.

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Akustinių bangų ir šviesos – akustooptinė (AO) sąveika įgalina tirti akustinių bangų savybes ne tik kristalo paviršiuje, bet ir tūryje. Tai aktualu kuriant tūrinių bangų prietaisus įvairiems taikymams. Iki šiol yra atlikta keletas AO difrakcijos eksperimentų, kai sunertiniais keitikliais žadinamos tūrinės bangos, bet ne nuotėkio paviršinių akustinių bangų (PAB) spinduliuotė į tūrį. Kita vertus, AO sąveiką galima efektyviai panaudoti šviesos parametrų valdyme. Tūrinių bangų AO prietaisai – šviesos moduliatoriai, deflektoriai, derinami filtrai plačiai naudojami praktikoje. Šioje disertacijoje pateikiami anizotropinės šviesos difrakcijos nuotėkio paviršinių akustinių bangų spinduliuote į kristalo tūrį ZX-LiNbO3 ir YX-LiTaO3 eksperimentiniai rezultatai ir teorinis modelis. Tokio tipo sąveika įgalina suderinti sunertinių PAB keitiklių technologijos privalumus su didesniu šviesos sąveikos su tūrinėmis akustinėmis bangomis efektyvumu. Dėmesys mišraus valentingumo manganitams, turintiems perovskito kristalinę gardelę vis didėja dėl fazinio virsmo paramagnetikas – feromagnetikas Kiuri temperatūroje, milžiniškosios magnetovaržos efekto, didelės unikalių tarpusavyje susijusių savybių įvairovės ir potencialo įvairiuose taikymuose. Dėl stiprios Jahn-Teller tipo elektron-fononinės sąveikos akustiniai metodai yra perspektyvūs tiriant manganitus. Šioje disertacijoje pateikiami nuotėkio paviršinių akustinių bangų spinduliuotės į tūrį sklidimo dariniuose La0.67Sr0.33MnO3 plėvelė –... [toliau žr. visą tekstą]
Acoustic wave and light – acousto-optic (AO) interaction provides an efficient tool for probing the acoustic wave properties not only at a crystal surface but also at any point within its bulk. This is topical in the design of the bulk wave devices for various applications. Meanwhile, there have been a few investigations of AO diffraction by (interdigital transducer) IDT-generated bulk waves, but not of the diffraction due to the radiation from leaky surface acoustic waves (SAWs). On the other hand, AO interaction enables efficient control of light parameters. Bulk wave AO devices have found numerous applications as light modulators, deflectors, tunable filters. In this PhD thesis, the experimental investigation and theoretical model of anisotropic light diffraction by leaky SAW radiation into crystal bulk in ZX-LiNbO3 and YX-LiTaO3 are reported. This type of interaction allows one to combine benefits of the IDT technology with the enhanced interaction efficiency of bulk-wave-type interaction. Mixed-valence perovskite manganites were studied intensively in recent years due to the observed paramagnetic to ferromagnetic transition at Curie temperature, colossal magnetoresistance effect, a variety of unique properties and potential at various applications. Due to the strong Jahn-Teller electron-phonon coupling the acoustic technique is effective tool for investigations of manganites. In this PhD thesis, the experimental investigation of the leaky SAW radiation propagating in... [to full text]
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Books on the topic "Manganiti"

1

F, Balakirev V. Manganity: Ravnovesnye i nestabilʹnye sostoi︠a︡nii︠a︡. Ekaterinburg: Rossiĭskai︠a︡ akademii︠a︡ nauk, Uralʹskoe otd-nie, In-t metallurgii, 2000.

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Chatterji, Tapan, ed. Colossal Magnetoresistive Manganites. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-015-1244-2.

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Kaplan, T. A., and S. D. Mahanti, eds. Physics of Manganites. Boston: Kluwer Academic Publishers, 2002. http://dx.doi.org/10.1007/b114807.

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Chatterji, Tapan. Colossal Magnetoresistive Manganites. Dordrecht: Springer Netherlands, 2004.

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A, Kaplan T., Mahanti S. D, and International Conference on Physics of Manganites (1998 : Michigan State University), eds. Physics of manganites. New York: Kluwer Academic/Plenum, 1999.

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Tapan, Chatterji, ed. Colossal magnetoresistive manganites. Dordrecht: Kluwer Academic Publishers, 2004.

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Iinkai, Kawanishi-shi Kyōiku. Kawanishi-shi Manganji. Kawanishi-shi: Kawanishi-shi Kyōiku Iinkai, 1985.

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Opsopoiōn manganeiai ēgoun kalogērikē mageirikē. 2nd ed. Tripotamos Eurytanias: Ekdosis Hieras Monēs Tatarnēs, 1992.

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Opsopoiōn manganeiai ēgoun kalogērikē mageirikē. 3rd ed. Tripotamos Eurytanias: Ekdosis Hieras Monēs Tatarnēs, 1995.

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Bärmer, Klaus. New trends in the characterization of CMR-manganites and related materials, 2005. Trivandrum, Kerala, India: Research Signpost, 2005.

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Book chapters on the topic "Manganiti"

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Ishihara, S. "Manganites." In Springer Series in Solid-State Sciences, 167–223. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-09298-9_4.

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Argyriou, Dimitri N., and Christopher D. Ling. "Crystal and Magnetic Structure from Hole to Electron Doped Manganites." In Colossal Magnetoresistive Manganites, 1–42. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-015-1244-2_1.

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Ramakrishnan, T. V., H. R. Krishnamurthy, S. R. Hassan, and G. Venketeswara Pai. "Theory of Manganites Exhibiting Colossal Magnetoresistance." In Colossal Magnetoresistive Manganites, 417–41. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-015-1244-2_10.

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Moussa, F., and M. Hennion. "Approach to the Metal-Insulator Transition in Manganites: A Neutron Scattering Study." In Colossal Magnetoresistive Manganites, 43–92. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-015-1244-2_2.

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Chuang, Y. D., and D. S. Dessau. "The Electronic Structure, Fermi Surface and Pseudogap in Manganites." In Colossal Magnetoresistive Manganites, 93–129. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-015-1244-2_3.

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Kim, K. H., M. Uehara, V. Kiryukhin, and S. W. Cheong. "Multi-Scale Phase Modulations in Colossal Magnetoresistance Manganites." In Colossal Magnetoresistive Manganites, 131–205. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-015-1244-2_4.

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Hotta, Takashi, and Elbio Dagotto. "Theory of Manganites." In Colossal Magnetoresistive Manganites, 207–62. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-015-1244-2_5.

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van den Brink, Jeroen, Giniyat Khaliullin, and Daniel Khomskii. "Orbital Effects in Manganites." In Colossal Magnetoresistive Manganites, 263–301. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-015-1244-2_6.

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Furukawa, Nobuo. "Magnetic Excitations of the Double Exchange Model." In Colossal Magnetoresistive Manganites, 303–19. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-015-1244-2_7.

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Chatterji, Tapan, George Jackeli, and Nic Shannon. "Spin Dynamics of Bilayer Manganites." In Colossal Magnetoresistive Manganites, 321–82. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-015-1244-2_8.

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Conference papers on the topic "Manganiti"

1

Nurgaliev, T., S. Miteva, B. Blagoev, E. Mateev, L. Neshkov, V. Strbik, S. Benacka, and S. Chromik. "HTS/Manganite Double Layer Structures." In SIXTH INTERNATIONAL CONFERENCE OF THE BALKAN PHYSICAL UNION. AIP, 2007. http://dx.doi.org/10.1063/1.2733529.

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Bhargav, Abhinav, Tejas M. Tank, and Sankar P. Sanyal. "Transport properties of Nd0.67Sr0.33Mn0.85Co0.15O3 manganite." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032655.

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Cohen, L. F. "Manganite metal oxides - understanding and application." In IEE Colloquium on Electro-Technical Ceramics - Processing, Properties and Applications. IEE, 1997. http://dx.doi.org/10.1049/ic:19971056.

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Hreb, Vasyl, Iryna Lutsyuk, Viktoria Kochubei, and Leonid Vasylechko. "New Mixed Manganites-chromites RMn1-xCrxO3 and Manganites-gallates RMn1-xGaxO3." In 2020 IEEE 10th International Conference Nanomaterials: Applications & Properties (NAP). IEEE, 2020. http://dx.doi.org/10.1109/nap51477.2020.9309643.

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Sandu, V., S. Popa, I. Ivan, C. Plapcianu, E. Sandu, N. Hurduc, and I. Nor. "Polymer functionalization with manganites." In Second International Conference on Smart Materials and Nanotechnology in Engineering, edited by Jinsong Leng, Anand K. Asundi, and Wolfgang Ecke. SPIE, 2009. http://dx.doi.org/10.1117/12.843221.

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Patil, Swapnilkumar S., Prafulla K. Jha, and Parag Bhargava. "Study of La0.9Sr0.1MnO3 manganite at different temperature." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON CONDENSED MATTER PHYSICS 2014 (ICCMP 2014). AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4915387.

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Putri, Witha B. K., Nelis Sa’adah, Dicky R. Munazat, and Budhy Kurniawan. "Structural characterization of La1-xBaxMnO3 manganite nanoparticles." In INTERNATIONAL CONFERENCE ON TRENDS IN MATERIAL SCIENCE AND INVENTIVE MATERIALS: ICTMIM 2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015552.

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Mazumdar, Dipak, Sanjib Banik, and I. Das. "Critical analysis of Y-doped La0.7Ca0.3MnO3 manganite." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0016585.

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Pandey, Namita, and Awalendra Kumar Thakur. "Relaxation behavior of oxygen deficient strontium manganite." In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4872972.

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Prajapat, C. L., M. R. Singh, S. K. Gupta, D. Bhattacharya, S. Basu, and G. Ravikumar. "Magnetic properties on strained manganite thin film." In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4873056.

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Reports on the topic "Manganiti"

1

Kiryukhin, V., D. Casa, B. Keimer, J. P. Hill, A. Vigliante, Y. Tomioka, and Y. Tokura. X-ray induced insulator-metal transitions in CMR manganites. Office of Scientific and Technical Information (OSTI), December 1997. http://dx.doi.org/10.2172/658155.

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Hundley, M. F., J. J. Neumeier, R. H. Heffner, Q. X. Jia, X. D. Wu, and J. D. Thompson. Interplay between electronic transport and magnetic order in ferromagnetic magnetic manganite thin films. Office of Scientific and Technical Information (OSTI), May 1997. http://dx.doi.org/10.2172/474948.

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Benham, R. A., L. J. Weirick, and L. M. Lee. Calibration of thin-foil manganin gauge in ALOX material. Office of Scientific and Technical Information (OSTI), August 1995. http://dx.doi.org/10.2172/102211.

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Peevy, G. R., W. G. Rivera, R. A. Benham, and B. D. Duggins. Calibration of Thin-Foil Manganin Gages for MFG/DQA. Office of Scientific and Technical Information (OSTI), January 2001. http://dx.doi.org/10.2172/773990.

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Tasker, Douglas, and John Lang. Manganin gauges: Methods, calibrations and use in explosive experiments. Office of Scientific and Technical Information (OSTI), April 2022. http://dx.doi.org/10.2172/1862787.

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Bao, W., J. D. Axe, C. H. Chen, S. W. Cheong, P. Schiffer, and M. Roy. From double exchange to superexchange in charge ordering perovskite manganites. Office of Scientific and Technical Information (OSTI), August 1998. http://dx.doi.org/10.2172/307963.

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Mannella, N., W. L. Yang, K. Tanaka, X. J. Zhou, H. Zheng, J. F. Mitchell, J. Zaanen, et al. Polaron Coherence Condensation As the Mechanism for Colossal Magnetoresistance in Layered Manganites. Office of Scientific and Technical Information (OSTI), November 2007. http://dx.doi.org/10.2172/920014.

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Phillips, D., C. May, K. Vandersall, and F. Garcia. Minimizing manganin/system noise for potential use in small geometry experiments. Office of Scientific and Technical Information (OSTI), October 2008. http://dx.doi.org/10.2172/945518.

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Keimer, B., D. Casa, V. Kiryukhin, O. A. Saleh, J. P. Hill, Y. Tomioka, and Y. Tokura. X-ray effects in charge-ordered manganites: A magnetic mechanism of persistent photoconductivity. Office of Scientific and Technical Information (OSTI), December 1998. http://dx.doi.org/10.2172/307972.

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Singh, Prabhakar, Manoj Mahapatra, Rampi Ramprasad, Nguyen Minh, and Scott Misture. Study of the Durability of Doped Lanthanum Manganite and Cobaltite Cathode Materials under ''Real World'' Air Exposure Atmospheres. Office of Scientific and Technical Information (OSTI), November 2014. http://dx.doi.org/10.2172/1183564.

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