Relevant bibliographies by topics / Charge-density-wave materials

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Academic literature on the topic 'Charge-density-wave materials'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Charge-density-wave materials"

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Fleming, R. M. "Low-frequency damping in charge-density wave materials." Synthetic Metals 19, no. 1-3 (March 1987): 983. http://dx.doi.org/10.1016/0379-6779(87)90491-7.

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Thorne, R. E., J. McCarten, D. A. DiCarlo, T. L. Adelman, and M. P. Maher. "Charge density wave pinning in NbSe3." Synthetic Metals 43, no. 3 (June 1991): 3935–40. http://dx.doi.org/10.1016/0379-6779(91)91712-j.

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Brazovskii, S., and S. Matveenko. "Solitons in charge density wave crystals." Synthetic Metals 43, no. 3 (June 1991): 4019–24. http://dx.doi.org/10.1016/0379-6779(91)91732-p.

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Cox, Susan, J. Singleton, R. D. McDonald, A. Migliori, and P. B. Littlewood. "Sliding charge-density wave in manganites." Nature Materials 7, no. 1 (December 2, 2007): 25–30. http://dx.doi.org/10.1038/nmat2071.

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Wang, Wen-Zheng, Chui-Lin Wang, Zhao-Bin Su, and Lu Yu. "Localized excitations in competing charge-density-wave and spin-density-wave systems." Synthetic Metals 56, no. 2-3 (April 1993): 3370–76. http://dx.doi.org/10.1016/0379-6779(93)90130-o.

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Wohlfeld, Krzysztof, Andrzej M. Oleś, and George A. Sawatzky. "Charge density wave in Sr14−xCaxCu24O41." physica status solidi (b) 247, no. 3 (March 2010): 668–70. http://dx.doi.org/10.1002/pssb.200983046.

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Eckern, U., and A. Geier. "Microscopic theory of charge-density wave systems." Zeitschrift f�r Physik B Condensed Matter 65, no. 1 (March 1986): 15–27. http://dx.doi.org/10.1007/bf01308395.

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Zettl, A., M. F. Hundley, and P. Parilla. "Magnetotransport studies in charge density wave conductors." Synthetic Metals 19, no. 1-3 (March 1987): 807–12. http://dx.doi.org/10.1016/0379-6779(87)90456-5.

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Sekine, Tomoyuki, Yoshinari Kiuchi, Mitsuru Izumi, Kunimitsu Uchinokura, Ryozo Yoshizaki, and Etsuyuki Matsuura. "Charge-density-wave phase transition in Nb3Te4." Synthetic Metals 19, no. 1-3 (March 1987): 875–80. http://dx.doi.org/10.1016/0379-6779(87)90468-1.

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Gabovich, A. M., A. I. Voitenko, J. F. Annett, and M. Ausloos. "Charge- and spin-density-wave superconductors." Superconductor Science and Technology 14, no. 4 (March 16, 2001): R1—R27. http://dx.doi.org/10.1088/0953-2048/14/4/201.

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Dissertations / Theses on the topic "Charge-density-wave materials"

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Rai, Ram C. "ELECTRO-OPTICAL STUDIES OF CHARGE-DENSITY-WAVE MATERIALS." UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_diss/427.

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A searched for narrow-band-noise (NBN) modulations of the infrared transmission in blue bronze has been performed. No modulations were observed, giving an upper limits for NBN changes in the absorption coefficient of )2000/(/3.0.andlt;.cmNBN. The implication of these results on proposed CDW properties and NBN mechanisms are discussed. An infrared microscope with a capability of doing both reflectance and transmission measurements has been integrated into the previous electro-transmission system with tunable diode lasers. Electro-optic experiments were done using the microscope for the studies of the CDW states of K0.3MoO3 (blue bronze) and orthorhombic TaS3. The electro-reflectance signal for blue bronze has been evidenced for the first time. The infrared reflectance of K0.3MoO3 varied with position when a voltage greater than the CDW depinning threshold is applied. The spatial dependence of .R/R was slightly different than for ./, in that the magnitude of .R/R decreased and, for low voltages and frequencies, the signal became inverted near the contacts. Perhaps the differences might be associated with changes in the CDW properties on the surface. For blue bronze, the electro-reflectance signal was measured to be smaller than electro-transmittance signal by one order of magnitude for light polarized transverse to the chain direction, while the electro-reflectance signal for parallel polarized light was found to be a few times smaller than for transverse polarized light. The fits of the electro-reflectance spectrum showed that the changes in background dielectric constant were ~ 0.05 % and/or oscillator strength and/or frequency shifts of the phonons were ~ 0.05 % and ~ 0.005 cm-1 in the applied electric field. We also found that parallel polarized phonons are affected by CDW strain, and these changes dominate the electro-reflectance spectrum. We have examined the electro-reflectance spectra associated with CDW current investigation for light polarized parallel to the conducting chains for signs of expected current-induced intragap states, and conclude that the density of any such states is at most a few times less than expected. We have observed a large (~1%) change in infrared reflectance of orthorhombic TaS3, when its CDW is depinned. The change is concentrated near one current contact. Assuming that the change in reflectance is proportional to the degree of CDW polarization, we have studied the dynamics of CDW repolarization through position dependent measurements of the variation of the electro-reflectance with the frequency of square wave voltages applied to the sample, and have found that the response could be characterized as a damped harmonic oscillator with a distribution of relaxation (i.e. damping) times. The average relaxation time, which increases away from the contacts, varies with applied voltage as with p ~ 3/2, but the distribution of times broadens as the voltage approaches the depinning threshold. Very low resonant frequencies (~ 1 kHz) indicate a surprisingly large amount of inertia, which is observable in the time dependence of the change in reflectance as a polarity dependent delay of ~ 100 s.
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Bellec, Ewen. "Study of charge density wave materials under current by X-ray diffraction." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS437/document.

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Ce manuscrit a pour sujet principal la diffraction par rayons X des matériaux ondes de densité de charges (ODC). Nous avons étudié le cristal quasi-1D NbSe3 ainsi que le quasi-2D TbTe3. Plusieurs grands instruments ont été utilisés pour cette étude, le synchrotron ESRF de Grenoble sur la ligne ID01 ainsi que le laser à électron libre LCLS à Stanford. Premièrement, grâce à la cohérence du faisceau X à LCLS, nous avons pu observer une perte de cohérence transverse dans NbSe3 lors de l’application d’un courant électrique au-dessus d’un certain seuil ainsi qu’une compression longitudinale de l’ODC. Ensuite, à l’ESRF, nous avons utilisé un faisceau X focalisé au micromètre par une Fresnel zone plate pour scanner l’ODC localement par diffraction sur NbSe3 puis ensuite sur TbTe3. Lorsqu’un courant est appliqué sur l’échantillon, nous avons observé une déformation transverse indiquant que l’ODC est bloquée au niveau de la surface de l’échantillon dans NbSe3. Dans le cas de TbTe3, l’ODC tourne sous courant présentant un cycle d’hystérésis lorsque le courant passe continument de positif à négatif. Nous avons aussi pu constater dans plusieurs régions, toujours pour TbTe3, la création de défauts d’irradiation localisés induisant une compression-dilatation de l’ODC. Dans une dernière partie théorique, nous montrons comment la théorie du transport électrique de l’ODC par un train de solitons portants chacun une charge ainsi que la prise en compte du blocage de l’ODC sur la surface de l’échantillon que nous avons vu expérimentalement permet de comprendre plusieurs mesures de résistivité en fonction des dimensions de l’échantillon trouvées dans la littérature. Nous présentons ensuite plusieurs idées pour expliquer du blocage de l’ODC sur les surfaces au niveau microscopique et proposons l’hypothèse d’une ODC commensurable en surface (et incommensurable dans le volume)
The main subject of this manuscript is the X-ray diffraction of charge density wave (CDW) materials. We studied the quasi-1D NbSe3 crystal and the quasi-2D TbTe3. Several large instruments facilities were used for this study, the ESRF synchrotron in Grenoble on the ID01 line and the LCLS free electron laser in Stanford. First, thanks to the coherence of the X-beam at LCLS, we were able to observe a loss of transverse coherence in NbSe3 when applying an electrical current above a certain threshold as well as a longitudinal compression of the CDW. Then, at the ESRF, we used an X-ray beam focused on the micrometer scale by a Fresnel zone plate to scan the CDW locally by diffraction on NbSe3 and on TbTe3. When a current is applied to the sample, we observed a transverse deformation indicating that the CDW is pinned on the sample surface in NbSe3. In the case of TbTe3, the CDW rotates under current showing a hysteresis cycle when one is continuously changing from positive to negative current. We have also observed in several regions, in TbTe3, the creation of localized irradiation defects inducing a compression-dilation of the CDW. In a last theoretical part, we show how the theory of electric transport in the CDW state by a train of charged solitons, as well as taking into account the CDW pinning on the surface of the sample that we have seen experimentally, allows us to understand several resistivity measurements, found in the literature, made on samples with different dimensions. Finally, we present several ideas for an explanation of the CDW pinning at the surfaces on a microscopic level and propose the hypothesis of a commensurate CDW on the surface (and incommensurate in volume)
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Ren, Yuhang. "Time-resolved optical studies of colossal magnetoresistance and charge -density wave materials." W&M ScholarWorks, 2003. https://scholarworks.wm.edu/etd/1539623421.

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This thesis presents measurements of collective modes and ultrafast carrier relaxation dynamics in charge-density-wave (CDW) conductors and colossal magnetoresistance (CMR) manganites. A femtosecond laser pump pulse excites a broad frequency spectrum of low-energy collective modes and electron-hole pairs thereby changing its optical properties. The low-energy collective excitations and quasiparticle relaxation and recombination processes are monitored by measuring the resulting photoinduced absorption as a function of probe pulse wavelength and time delay.;A general model was developed for the photogeneration and detection mechanism of collective modes based on light absorption in two-color pump-probe experiments. A broad spectrum of collective modes (phasons and amplitudons) with frequencies down to a few GHz is excited and propagates normal to the surface into the material. The dispersion of the long-wavelength phason and amplitudon can be measured by changing the probe wavelength.;The first pump-probe spectroscopy was performed from the ultraviolet to mid-infrared wavelength range to study low-frequency collective excitations, including temperature evolution, dispersion, damping, and anisotropy of amplitude mode and transverse phason in quasi-one dimensional CDW conductors, K 0.3MoO3 and K0.33MoO3 on ultrafast time scale. The transverse phason exhibits an acoustic-like dispersion relation in the frequency range from 5--40 GHz. The phason velocity is strongly anisotropic with a very weak temperature dependence. In contrast, the amplitude mode exhibits a weak (optic-like) dispersion relation with a frequency of 1.66 THz at 30 K.;The studies were extended to doped perovskite manganite thin films and single crystals. A low-energy collective mode is observed and discussed in terms of the opening of a pseudogap resulting from charge/orbital ordering phases. The softening of the collective mode is necessary to explain by combining a cooperative Jahn-Teller type distortion of the MnO6 octahedra with the collective mode. The quasiparticle dynamics in the vicinity of the metal-insulator transition is strongly affected by the presence of a pseudogap, phase separation and percolation, which are strongly dependent on temperature. A very long-lived relaxation process is observed due to a slow spin relaxation process. The dynamics of the spin system is further investigated in strained and unstrained thin films, which show a strong strain effect.
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Federico, Mazza. "First Principle Calculations & Inelastic Neutron Scattering on the Single-Crystalline Superconductor LaPt2Si2." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278071.

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This work presents a comprehensive study on single crystalline LaPt2Si2, in which superconductivity and a charge density wave (CDW) coexist. The usage of density functional theory (DFT) modeling and Inelastic Neutron Scattering has been the primary form of investigation, in order to determine all the characteristic features of the sample taken under consideration. From the results one can observe that the Fermi surface nesting is the primary contributor for the CDW wavevector ~qCDW = (1/3, 0, 0). In addition, the phonon density of states present two typical energy levels, with soft modes in the Pt3-Pt4 layer coherent with the presence of a CDW. The superconducting temperature has been estimated at Tc = 1.6 K. The experimental data from the inelastic instrument High Resolution Chopper Spectrometer (HRC) at the J-PARC neutron source are in good agreement with the theoretical simulations, showing the same energy levels for the polarization phonon modes (from 4 to 18 meV and from 32 to 42 meV).
Denna rapport presenterar en omfattande studie av enkristalls LaPt2Si2 i vilken supraledning och en laddningsdensitetsvåg (CDW) samexisterar. Användandet av DFT-modellering och neutronspridning har varit de huvudsakliga undersökningsmetoderna, för att bestämma alla karakteristiska drag hos det undersökta provet. Från resultaten kan observeras att den inneslutna Fermiytan är den huvudsakliga bidragaren till CDW-vågvektorn~qCDW = (1/3, 0, 0). Vidare visar den närvarande fonontillståndsdensiteten två typiska energinivåer, med mjuka lägen i Pt3-Pt4-skiktet, som stämmer överens med närvaron av en CDW. Den supraledande temperaturen har uppskattats till Tc = 1.6 K. Experimentella data från det inelastiska instrumentet HRC vid J-PARCs neutronkälla stämmer väl överens med teoretiska simuleringar, som visar samma energinivåer för polarisationsfononlägena (från 4 till 18 meV och från 32 till 42 meV).
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Leriche, Raphaël. "Unconventional superconductivity in quasi-2D materials with strong spin-orbit coupling." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS577.

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La réalisation de supraconducteurs topologiques constitue un des principaux enjeux actuels de la physique de la matière condensée. Il a en effet été prédit que ces systèmes devaient abriter des fermions de Majorana. Ces fermions de Majorana disposent à la fois d’une statistique non-abélienne et, du fait de leur origine topologique, d’une robustesse face au désordre local, ce qui les rend très attrayants pour des applications en informatique quantique. Une approche susceptible de conduire à de la supraconductivité topologique consiste à considérer des systèmes supraconducteurs à fort couplage spin-orbite et brisant la symétrie d’inversion. C’est dans cette optique que, dans le cadre de cette thèse, j’ai effectué des mesures de microscopie et spectroscopie par effet tunnel sur des matériaux quasi-bidimensionnels : (LaSe)1,14(NbSe2)2 et Sr2IrO4.J’ai tout d’abord étudié les propriétés électroniques du matériau incommensurable (LaSe)1,14(NbSe2)2, proche parent du composé dichalcogénure de métaux de transition 2HNbSe2. (LaSe)1,14(NbSe2)2 est une hétérostructure faite d’alternances de biplans NbSe2 à géométrie prismatique trigonale et de biplans de LaSe avec une structure de sel de roche. Le fort couplage spin-orbite ainsi que la non-centrosymétrie présents dans les plans NbSe2 font de (LaSe)1,14(NbSe2)2 un potentiel candidat pour de la supraconductivité topologique. Dans cette thèse, je présente des résultats de spectroscopie montrant que la structure électronique de (LaSe)1,14(NbSe2)2 est similaire à celle de la monocouche de NbSe2 avec un dopage de type électron accompagné par un déplacement du potentiel chimique de 0,3 eV, jusqu’alors inégalé. J’ai également pu démontrer la nature quasi–bidimensionnelle de (LaSe)1,14(NbSe2)2 et notamment la présence d’un fort couplage spin-orbite de type Ising. De plus, la faible robustesse de la supraconductivité vis à vis du désordre non magnétique couplée à des mesures d’interférences de quasiparticules m’a permis de mettre en avant le caractère non conventionnel du paramètre d’ordre supraconducteur dans (LaSe)1,14(NbSe2)2. Cette étude permet d’envisager l’utilisationd’hétérostructures incommensurables telles que (LaSe)1,14(NbSe2)2 pour explorer la physique des dichalcogénures de métaux de transition dans la limite bidimensionnelle, pour laquelle de nombreuses études théoriques ont prédit une supraconductivité topologique. Dans cette thèse, je présente également une étude des effets du dopage sur les propriétés électroniques de l’oxyde d’iridium Sr2IrO4. Sr2IrO4 est un isolant de Mott non conventionnel puisqu’il doit cette propriété à la présence d’un fort couplage spin-orbite. Du fait d’une brisure locale de la symétrie d’inversion, certaines prédictions théoriques ont pu montrer que Sr2IrO4 devrait devenir un supraconducteur topologique une fois dopé. Ici, je montre qu’avec le dopage, Sr2IrO4 subit une transition de phase inhomogène à l’échelle nanométrique entre un état isolant de Mott et un état pseudo-métallique. Ce travail justifie la pertinence d’utiliser une sonde locale telle que le microscope à effet tunnel afin de venir compléter des résultats sur la physique de Mott obtenus par des méthodes intégratives comme la spectroscopie électronique résolue en angle
The realization of topological superconductors is one of the main current goals of condensed matter physics. It was indeed predicted that such systems should host Majorana fermions. These Majorana fermions possess both a non-Abelian statistics and, because of their topological origin, a certain robustness against local disorder, which makes them attractive for quantum computing applications. One approach likely to lead to topological superconductivity consists in considering superconducting systems with strong spin-orbit coupling and with broken inversion symmetry. It is in this framework that, during this thesis, I performed scanning tunneling microscopy and spectroscopy measurements on quasi-2D materials : (LaSe)1,14(NbSe2)2 and Sr2IrO4. I first studied the electronic properties of misfit compound LaNb2Se5, which is a parent of transition metal dichalcogenide 2H-NbSe2. (LaSe)1,14(NbSe2)2 is a heterostructure made out of alternations of NbSe2 bilayers with trigonal prismatic geometry and LaSe bilayers with rocksalt structure. (LaSe)1,14(NbSe2)2 is a potential candidate for topological superconductivity because of the presence of both a strong spin-orbit coupling and of broken inversion symmetry in NbSe2 planes. Here, I present spectroscopic results showing that the electronic structure of(LaSe)1,14(NbSe2)2 is very similar to the one of electron-doped monolayer NbSe2 with a shift of the chemical potential of 0,3 eV, priorly never reached. I could also demonstrate the quasi- 2D nature of (LaSe)1,14(NbSe2)2 and more particularly the presence of a strong Ising spinorbit coupling. Moreover, the observed weakness of superconductivity against non-magnetic disorder combined with quasiparticle interferences measurements allowed me to exhibit the unconventional nature of (LaSe)1,14(NbSe2)2 superconducting order parameter. This study opens the possibility to use misfit heterostructures such as (LaSe)1,14(NbSe2)2 to study thephysics of transition metal dichalcogenides in the 2D limit, for which many theoretical studies predict topological superconductivity. In this thesis, I also present a study on the effects of doping on the electronic properties of iridate compound Sr2IrO4. Sr2IrO4 is a spin-orbit induced Mott insulator. Because inversion symmetry is locally broken in Sr2IrO4, some theoretical predictions suggest that Sr2IrO4 should turn into a topological superconductor once doped. Here, I exhibit a nanometer-scaleinhomogeneous doping-driven Mott insulator to pseudo-metallic phase transition. This work further justifies the importance of using a local probe such as scanning tunnelling microscopy in order to complete results on Mott physics obtained by integrative methods like angle-resolved photoemission spectroscopy
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Gonzalez, Vallejo Isabel. "Study of the structural dynamics of phase transitions using time resolved electron and X-ray diffraction." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS496.

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L'application d'une perturbation externe à certains matériaux (tels que la température, la pression ou la lumière) provoque souvent l'émergence de nouvelles propriétés macroscopiques dont l'origine se situe au niveau atomique. Par conséquent, une étude détaillée de la dynamique atomique devient essentielle pour la compréhension de processus tels que les transformations chimiques ou les transitions de phase. Dans le cas particulier des transitions de phase structurales, la symétrie du cristal est soumise à une transformation entre deux états différents à une valeur critique. Les échelles de temps typiques de la dynamique structurale sont de l'ordre de quelques centaines de femtosecondes à plusieurs picosecondes. Le développement des impulsions laser femtosecondes a permis aux chercheurs d'accéder aux échelles de temps nécessaires pour explorer la dynamique structurale ultra-rapide. Plus précisément, la diffraction résolue en temps s'est révélée être une technique idéale pour suivre et dévoiler les voies hors équilibre suivies par le réseau après une courte impulsion laser. Cette thèse présente des études expérimentales réalisées par des techniques de diffraction d'électrons et de rayons X résolue en temps sur deux transitions de phase structurelles différentes. Dans une première partie, nous démontrons les capacités du montage expérimental de diffraction d'électrons ultra-rapide (UED) développé au Laboratoire d'Optique Appliquée. Nos résultats expérimentaux réalisés sur des échantillons monocristallins de haute qualité sont présentés ainsi qu'une étude quantitative des implications des effets de diffraction dynamique dans les expériences UED. Dans une deuxième partie, nous présentons un ensemble d'expériences de diffraction d'électrons pompe-sonde réalisée sur GdTe₃, un composé appartenant à la famille des Tritellurides de terres rares qui présente un état d'onde de densité de charge. L'arrivée d'une excitation optique déclenche la transition de phase de manière non thermique. La dynamique de relaxation est caractérisée par un ralentissement qui augmente avec la fluence incidente ainsi qu'avec la température initiale de l'échantillon. Ces résultats éclairent les interprétations controversées actuelles concernant l’ émergence de défauts topologiques photo-induits.Dans une troisième partie, nous présentons des expériences de diffraction des rayons X en temps résolu réalisées à la ligne CRISTAL du synchrotron SOLEIL. Dans ce cas, nous avons étudié le composé A15 Nb₃Sn, qui présente une transition de phase d'une symétrie cubique à une symétrie tétragonale à l'équilibre thermique. Les résultats de notre expérience pompe-sonde mettent en évidence une réponse différente du réseau par rapport à la transition d’ équilibre thermique, ce qui encourage les futures recherches sur la dynamique structural de ce matériau
The application of an external perturbation in certain materials (such as temperature, pressure or light) often gives rise to the emergence of new macroscopic properties with their origin at the atomic level. Therefore, a detailed study of the atomic dynamics becomes essential to the understanding of processes such as chemical transformations or phase transitions. In the particular case of structural phase transitions, the symmetry of the crystal undergoes a transformation between two different states at a given critical value. The typical time scales of the structural dynamics occur on the order of few hundreds of femtoseconds to several picoseconds. The development of femtosecond laser pulses has enabled scientists to access the required time scales to explore the ultrafast dynamics of the lattice structure in the relevant time scales. More precisely, time-resolved diffraction has proven to be an ideal technique to track and unveil the out-of-equilibrium pathways followed by the lattice after a short laser pulse.This thesis presents experimental studies performed by time-resolved electron and X-ray diffraction techniques on two different structural phase transitions. In a first part, we demonstrate the capabilities of the ultrafast electron diffraction (UED) experimental setup developed at Laboratoire d’Optique Apliquée. Our UED experimental results performed on high quality single crystal samples are presented along with a quantitative study of the implications of dynamical diffraction effects in UED experiments. In a second part, we present a set of pump-probe electron diffraction experiments performed on GdTe₃, a compound belonging to the rare-earth Tritellurides family which presents a charge density wave state. The arrival of an optical excitation triggers the phase transition non-thermally with the out-of-equilibrium relaxation dynamics of the charge density wave state characterized by slowing down that increases with incident fluence as well as with initial sample temperature. These results shed more light on current controversial interpretations involving the emergence of photoinduced topological defects. In a third part, we present time resolved X-ray diffraction experiments performed at CRISTAL beamline at SOLEIL synchrotron. In this case we have studied the A15 compound Nb₃Sn, which displays a displacive phase transition evolving from cubic to tetragonal symmetry at thermal equilibrium. Our pump-probe results present evidence of a different lattice response with respect to the thermal equilibrium transition, encouragingf uture investigations on the dynamics of this material
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Chapeau-Blondeau, François. "Etude des mecanismes de polarisation electrique du polyethylene basse densite." Paris 6, 1987. http://www.theses.fr/1987PA066301.

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Cette these presente une etude des mecanismes de polarisation electrique du polyethylene basse densite, realisee au moyen d'une methode experimentale qui met en oeuvre la propagation d'une onde de pression induite par laser. Cette methode permet de mesurer, de facon non destructive, la repartition spatiale des charges ou des champs electriques dans un materiau dielectrique
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Ren, Zhensong. "Combined neutron, transport and material based investigation in Ca₃Ir₄Sn₁₃." Thesis, Boston College, 2015. http://hdl.handle.net/2345/bc-ir:104538.

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Thesis advisor: Stephen D. Wilson
This dissertation investigates the cubic type II superconductor, Ca₃Ir₄Sn₁₃, discovered by Remeika and the coauthors more than 30 years ago. It was originally discovered be to a superconductor and later suggested to host ferromagnetic spin fluctuations, which lead to a peak-like anomaly in thermodynamic and transport measurements. Later detailed x-ray single crystal structural refinement associated the peak-like anomaly in transport and magnetization measurements with a charge density wave phase transition at the same temperature. The potential charge density wave phase transition T* can be suppressed either by pressure or chemical potential through substitution on the Ca and Ir site such that a temperature-pressure/composition phase diagram can be constructed. Upon investigating magnetism in this compound, polarized neutron scattering and μSR data from our group and other researchers did not reveal any magnetic order or magnetic spin fluctuations at the time scale of μSR . However, through the partial substitution of Ir by Rh, we realized a structural quantum critical point at ambient pressure with 30% of Ir substituted by Rh--providing the research community a valuable material's platform for studying the interplay between 3D charge density wave order and superconductivity. On the other hand, our surprising discovery of the weak HHL (L=odd) type of super-lattice peaks from neutron scattering led us to a tentative model of a distorted Ca sublattice in this material. The similarity of the lattice instabilites of the Remeika compound and A15 superconductors are discussed, which may give us more insight into its role in the formation of the superconducting phase
Thesis (PhD) — Boston College, 2015
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Physics
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Books on the topic "Charge-density-wave materials"

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(Editor), F. W. Boswell, and J. Craig Bennett (Editor), eds. Advances in the Crystallographic and Microstructural Analysis of Charge Density Wave Modulated Crystals (Physics and Chemistry of Materials with Low-Dimensional Structures). Springer, 1999.

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Book chapters on the topic "Charge-density-wave materials"

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Rammal, R., and P. B. Littlewood. "Glassy Relaxation in Charge Density Wave Systems." In Time-Dependent Effects in Disordered Materials, 343–57. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-7476-3_37.

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Mutka, Hannu. "Influence of Defects and Impurities on Charge Density Wave Systems." In Physics and Chemistry of Materials with Low-Dimensional Structures, 153–84. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4603-6_5.

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Smontara, A., K. Biljaković, and S. N. Artemenko. "Contribution of Phasons in the Thermal Conductivity of Charge-Density-Wave Materials." In Springer Series in Solid-State Sciences, 53–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84888-9_20.

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Aubry, Serge, and Pascal Quemerais. "Breaking of Analyticity in Charge Density Wave Systems: Physical Interpretation and Consequences." In Physics and Chemistry of Materials with Low-Dimensional Structures, 295–405. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0447-7_6.

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Prodan, Albert, and Andrzej Budkowski. "Alternative Approaches to the Crystallographic Description of Charge Density Wave Modulated Systems." In Physics and Chemistry of Materials with Low-Dimensional Structures, 1–39. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4603-6_1.

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Bennett, J. C., and F. W. Boswell. "Charge Density Wave Phase Transitions and Microstructures in the TaTe4 — NbTe4 System." In Physics and Chemistry of Materials with Low-Dimensional Structures, 69–120. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4603-6_3.

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Dai, Hongjie, Jie Liu, and Charles M. Lieber. "Elucidating Complex Charge Density Wave Structures in Low-Dimensional Materials by Scanning Tunneling Microscopy." In Physics and Chemistry of Materials with Low-Dimensional Structures, 225–57. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4603-6_7.

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Wiesendanger, R. "Scanning Tunneling Microscopy and Atomic Force Microscopy on Charge Density Wave and Related Materials." In Physics and Chemistry of Low-Dimensional Inorganic Conductors, 229–39. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1149-2_13.

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Schlenker, Claire, Jean Dumas, Claude Escribe-Filippini, and Hervé Guyot. "Charge Density Wave Instabilities and Transport Properties of the Low Dimensional Molybdenum Bronzes and Oxides." In Physics and Chemistry of Materials with Low-Dimensional Structures, 159–257. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0447-7_4.

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Walker, Michael B. "Phenomenological Theory of Charge-Density-Wave Phase Transitions in the NbTe4 — TaTe4 Series of Compounds." In Physics and Chemistry of Materials with Low-Dimensional Structures, 7–33. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-1299-2_2.

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Conference papers on the topic "Charge-density-wave materials"

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Koley, S., N. Mohanta, and A. Taraphder. "Unusual charge-density-wave order in 2H-NbSe[sub 2]." In FUNCTIONAL MATERIALS: Proceedings of the International Workshop on Functional Materials (IWFM-2011). AIP, 2012. http://dx.doi.org/10.1063/1.4736883.

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Zhang, Yingchao, Xun Shi, Wenjing You, Zhensheng Tao, Yigui Zhong, Fairoja Cheenicode Kabeer, Pablo Maldonado, et al. "Coherent electron-phonon couplings in a charge density wave material." In International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/up.2020.tu3b.5.

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Kim, S. S., J. A. Leicht, and S. L. Dexheimer. "Spectral Evolution of Nonlinear Excitations in a Quasi-One-Dimensional Charge Density Wave Material." In Laser Science. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/ls.2019.lw6e.3.

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Brundage, Aaron L. "Modeling Compressive Reaction in Shock-Driven Secondary Granular Explosives." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44130.

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Hexanitrostilbene (HNS) is a secondary, granular explosive with a wide usage in commercial and governmental sectors. For example, HNS is used in the aerospace industry as boosters in rockets, in the oil and gas industry in linear shaped charge designs in wellbore perforating guns, and in a number of applications in the US Department of Energy (DOE) and Department of Defense (DoD). In many of these applications, neat granules of HNS are pressed without binder and device performance is achieved with shock initiation of the powdered bed. Previous studies have demonstrated that powdered explosives do not transmit sharp shocks, but produce dispersive compaction waves. These compaction waves can induce combustion in the material, leading to a phenomenon termed Deflagration-to-Detonation Transition (DDT). The Baer-Nunziato (B-N) multiphase model was developed to predict compressive reaction in granular energetic materials due to shock and non-shock inputs using non-equilibrium multiphase mixture theory. The B-N model was fit to historical data of HNS, and this model was used to predict recent impact experiments where samples pressed to approximately 60% of theoretical maximum density (TMD) were shock loaded by high-velocity flyers [1]. Shock wave computations were performed using CTH, an Eulerian, multimaterial, multidimensional, finite-volume shock physics code developed at Sandia National Laboratories [2]. Predicted interface velocities using the B-N model were shown to be in good agreement with the measurements. Furthermore, an uncertainty quantification study was performed and the computational results are presented with best estimates of uncertainty.
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Shibata, Daisuke, and Takayuki Utsumi. "Numerical Solutions of Poisson Equation by the CIP-Basis Set Method." In ASME 2009 InterPACK Conference collocated with the ASME 2009 Summer Heat Transfer Conference and the ASME 2009 3rd International Conference on Energy Sustainability. ASMEDC, 2009. http://dx.doi.org/10.1115/interpack2009-89150.

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An accurate and reliable real space method for the ab initio calculation of electronic-structures of materials has been desired. Historically, the most popular method in this field has been the Plane Wave method. However, because the basis functions of the Plane Wave method are not local in real space, it is inefficient to represent the highly localized inner-shell electron state and it generally give rise to a large dense potential matrix which is difficult to deal with. Moreover, it is not suitable for parallel computers, because it requires Fourier transformations. These limitations of the Plane Wave method have led to the development of various real space methods including finite difference method and finite element method, and studies are still in progress. Recently, we have proposed a new numerical method, the CIP-Basis Set (CIP-BS) method [1], by generalizing the concept of the Constrained Interpolation Profile (CIP) method from the viewpoint of the basis set. This method uses a simple polynomial basis set that is easily extendable to any desired higher-order accuracy. The interpolating profile is chosen so that the sub-grid scale solution approaches the local real solution by the constraints from the spatial derivative of the original equation. Thus the solution even on the sub-grid scale becomes consistent with the master equation. By increasing the order of the polynomial, this solution quickly converges. The governing equations are unambiguously discretized into matrix form equations requiring the residuals to be orthogonal to the basis functions via the same procedure as the Galerkin method. We have already demonstrated that the method can be applied to calculations of the band structures for crystals with pseudopotentials. It has been certified that the method gives accurate solutions in the very coarse meshes and the errors converge rapidly when meshes are refined. Although, we have dealt with problems in which potentials are represented analytically, in Kohn-Sham equation the potential is obtained by solving Poisson equation, where the charge density is determined by using wave functions. In this paper, we present the CIP-BS method gives accurate solutions for Poisson equation. Therefore, we believe that the method would be a promising method for solving self-consistent eigenvalue problems in real space.
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Long, Frederick H., Steven P. Love, and Basil I. Swanson. "Quantum lattice fluctuations in a one-dimensional charge density wave material: luminescence and resonance Raman studies of an MX solid." In OE/LASE'93: Optics, Electro-Optics, & Laser Applications in Science& Engineering, edited by Shahab Etemad. SPIE, 1993. http://dx.doi.org/10.1117/12.148449.

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Siddiqui, Khalid M., Daniel B. Durham, Frederick Cropp, Sangeeta Rajpurohit, Colin Ophus, Yanglin Zhu, Johan Carlstroem, et al. "Visualizing the melting of periodic lattice distortions in a complex 2D charge density wave material via MeV-scale ultrafast electron diffraction." In Ultrafast Phenomena and Nanophotonics XXV, edited by Markus Betz and Abdulhakem Y. Elezzabi. SPIE, 2021. http://dx.doi.org/10.1117/12.2577621.

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Reports on the topic "Charge-density-wave materials"

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Coleman, R. V., Zhenxi Dai, W. W. McNairy, C. G. Slough, and Chen Wang. Surface structure and spectroscopy of charge-density wave materials using scanning tunneling microscopy. Office of Scientific and Technical Information (OSTI), December 1991. http://dx.doi.org/10.2172/10122090.

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Coleman, R. V., Zhenxi Dai, W. W. McNairy, C. G. Slough, and Chen Wang. Surface structure and spectroscopy of charge-density wave materials using scanning tunneling microscopy. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/5901839.

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Creager, W. N. Far infrared conductivity of charge density wave materials and the oxygen isotope effect in high-T sub c superconductors. Office of Scientific and Technical Information (OSTI), September 1991. http://dx.doi.org/10.2172/6112541.

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