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Academic literature on the topic 'YBa2Cu3O7'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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Journal articles on the topic "YBa2Cu3O7"

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Zhou, Zhigang, and Alexandra Navrotsky. "Thermochemistry of the Y2O3–BaO–Cu–O system." Journal of Materials Research 7, no. 11 (1992): 2920–35. http://dx.doi.org/10.1557/jmr.1992.2920.

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High temperature reaction calorimetry using molten lead borate as a solvent is used to study the thermochemistry of phases in the Y2O3–BaO–Cu–O system. Enthalpies of formation of YBa2Cu3Ox (6 < x < 7), YBa2Cu4O8, Y2BaCuO5, Y2Cu2O5, and BaCuO2.01 phases have been determined. The thermodynamic relationships among these phases at room temperature have been assessed. The results show that the 123 phase is not thermodynamically stable with respect to assemblages containing combinations of Y2BaCuO5, Y2Cu2O5, BaCuO2, Y2O3, and CuO. The fully oxidized 123 phase is not stable with respect to the 124 and the above assemblages. Reactions at room temperature are shown as follows: YBa2Cu3O7 (s) + CuO (s) → YBa2Cu4O8 (s); δH = −31.9 ± 22.3 kJ mol−1 and YBa2Cu3O6.76 (s) → ½YBa2Cu4O8 (s) + ¼Y2BaCuO5 (s) + ¾BaCuO2.01 (s); δH = −78.9 ± 21.0 kJ mol−1.

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Milonopoulou, V., K. M. Forster, J. P. Formica, J. Kulik, J. T. Richardson, and D. Luss. "Influence of oxygen partial pressure on the kinetics of YBa2Cu3O7−x formation." Journal of Materials Research 9, no. 2 (1994): 275–85. http://dx.doi.org/10.1557/jmr.1994.0275.

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The YBa2Cu3O7−x formation kinetics from a spray-roasted precursor powder containing Y2O3, BaCO3, and CuO was followed via in situ, time-resolved x-ray diffraction as a function of gas atmosphere and temperature. In inert atmospheres, BaCO3 and CuO form BaCu2O2 which subsequently reacts with Y2O3 to form YBa2Cu3O6. However, YBa2Cu3O6 decomposes at temperatures exceeding 725 °C with Y2BaCuO5 being one of the decomposition products. In oxidizing atmospheres, YBa2Cu3O7−x formation involves the BaCuO2. At high temperatures (800–840 °C), oxygen increases the yield of YBa2Cu3O6. A nuclei growth model assuming two-dimensional, diffusion-controlled growth with second-order nucleation rate fits the experimental data.

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Garzon, Fernando H., Ian D. Raistrick, D. S. Ginley, and John W. Halloran. "Thermodynamic instability of the YBa2Cu3O7−x phase at the 1:2:3 composition." Journal of Materials Research 6, no. 5 (1991): 885–87. http://dx.doi.org/10.1557/jmr.1991.0885.

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We have measured enthalpies of formation of YBa2Cu3O7−x, Y2BaCuO5, YBa2Cu4O8, and BaCuO2 using high precision isothermal solution calorimetry. Thermodynamic analysis of the calorimetric data indicates that YBa2Cu3O7−x at the pure-phase composition (1:2:3 cation ratio) is metastable at ≍873 K and 1 atm Po2.

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Cargnoni, Fausto, and Marco Scavini. "Direct-space analysis of the electronic structure of the YBa2Cu3O6 and YBa2Cu3O7 crystals." Canadian Journal of Chemistry 80, no. 3 (2002): 235–44. http://dx.doi.org/10.1139/v02-014.

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The electronic structure of the YBa2Cu3O6 and YBa2Cu3O7 crystals is investigated by means of fully periodic-restricted HartreeFock LCAO (linear combination of atomic orbitals) pseudopotential calculations. To give a detailed description of the bonding and atomic properties of the materials studied we selected the quantum theory of atoms in molecules approach, and complementary information is obtained from the analysis of the electron localization function in specific cell regions. The main features of the YBa2Cu3O6 and YBa2Cu3O7 crystals' electron densities are detailed and compared with available experimental data. Since the superconducting transition requires oxidation of the YBa2Cu3O6 crystal, we focused on the electronic rearrangements related to the inclusion of oxygen. CuO planes, probably responsible for the superconducting transition, exhibit peculiar electronic properties.Key words: superconducting cuprates, electron density, ab initio calculations.

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Brinkmann, Detlef, and Andrei Yu Zavidonov. "Nuclear Spin-lattice Relaxation in Cuprate Superconductors – Some New Approaches." Zeitschrift für Naturforschung A 57, no. 6-7 (2002): 479–87. http://dx.doi.org/10.1515/zna-2002-6-735.

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This paper reviews theoretical studies of nuclear spin-lattice relaxation we have made for the normal state of the cuprate high-temperature superconductors YBa2Cu3O7, YBa2Cu4O8, and La2-xSrx CuO4. In the case of planar sites, we calculated the dynamic spin susceptibility within a constraint-free theory based on the presentation of the model in terms of Hubbard operators. The results for 63Cu, 17O, and 89Y are in good agreement with experimental data. The relaxation (and the Knight shift) of chain Cu in YBa2Cu3O7 and YBa2Cu4O8 requires a different treatment; our approach uses the Luttinger-liquid model. Again, good agreement with experiment is achieved

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Della Valle, Raffaele Guido. "Lattice stability of YBa2Cu3O6 and YBa2Cu3O7." Physica C: Superconductivity 185-189 (December 1991): 1679–80. http://dx.doi.org/10.1016/0921-4534(91)90966-3.

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Owens, F. J., B. L. Ramakrishna та Z. Iqbal. "EPR in YBa2Cu3O7−δ and YBa2Cu3O6+x". Physica C: Superconductivity 156, № 2 (1988): 221–24. http://dx.doi.org/10.1016/0921-4534(88)90811-8.

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Watanabe, H., B. Kabius, B. Roas, and K. Urban. "Xenon ion irradiation of superconducting YBa2Cu3O7 thin films." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 92–93. http://dx.doi.org/10.1017/s0424820100173595.

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Recently it was reported that the critical current density(Jc) of YBa2Cu2O7, in the presence of magnetic field, is enhanced by ion irradiation. The enhancement is thought to be due to the pinning of the magnetic flux lines by radiation-induced defects or by structural disorder. The aim of the present study was to understand the fundamental mechanisms of the defect formation in association with the pinning effect in YBa2Cu3O7 by means of high-resolution electron microscopy(HRTEM).The YBa2Cu3O7 specimens were prepared by laser ablation in an insitu process. During deposition, a substrate temperature and oxygen atmosphere were kept at about 1073 K and 0.4 mbar, respectively. In this way high quality epitaxially films can be obtained with the caxis parallel to the <100 > SrTiO3 substrate normal. The specimens were irradiated at a temperature of 77 K with 173 MeV Xe ions up to a dose of 3.0 × 1016 m−2.

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Huong, Pham V. "Microstructure of superconductor bulk materials and thin films." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (1992): 1542–43. http://dx.doi.org/10.1017/s0424820100132340.

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The microstructure of single crystals of Y-Ba-Cu-O, Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O prepared by different methods were studied by various physical techniques, in particular by Raman microspectroscopy.Correlations have been established between Raman spectra and structure, allowing the determination of crystalline geometry of the material versus the composition and the preparation parameters.For YBa2Cu3Ox, a relationship: x = 0.025 VH - 5.57 is proposed and permits to evaluate the oxygen content by measuring simply in ZZ scattering geometry the Cu-O stretching mode V'H along the c axis of the crystal. This frequency varies from 465 cm-1 in YBa2Cu3O6 to 503 cm-l in YBa2Cu3O7 (Fig.l).This technique also offers the possibility to follow the structural conversion Y124 into Y123 and TI2212 into TI1212 (Fig.2) by appropriate thermal treatment. The preferentiel departure of the “CuO” or “TIO” chain/layer (Fig.3) is explained by weaker interaction forces between these layers and the adjacent ones, compared to those between the remaining layers. This helps to predict the localization of an eventual intercation in Y123 and TI1212.

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HANUZA, J., J. KLAMUT, R. HORYŃ, and B. JEŹOWSKA-TRZEBIATOWSKA. "THE POSSIBILITY OF THE LIBRATIONAL MECHANISM OF HIGH-TEMPERATURE SUPERCONDUCTIVITY IN THE YBa2Cu3O7−x TYPE TERNARY OXIDE." Modern Physics Letters B 02, no. 03n04 (1988): 667–71. http://dx.doi.org/10.1142/s0217984988000321.

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IR absorption and reflectance spectra as well as Raman scattering spectra of the YBa2Cu3O 7−x superconductor in the orthorhombic phase have been measured at temperatures below and above the critical point. The role of librational modes in the superconductive transition is discussed. The mechanism of the high-temperature superconductivity of YBa2Cu3O7− x is proposed based on the electron coupling by libron.

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Dissertations / Theses on the topic "YBa2Cu3O7"

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Keil, Stefan. "Flussquantenabbildung und lokale Analyse von niederfrequentem Flussrauschen in YBa2Cu3O7-d [YBa2Cu3O7-Delta] dc SQUIDs." [S.l.] : [s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=963170228.

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Bernardi, Juliane Carla. "Nanoestruturas de óxidos supercondutores de YBa2Cu3O7." reponame:Repositório Institucional da UFABC, 2016.

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Orientadora: Profa. Dra. Marcia Tsuyama Escote<br>Tese (doutorado) - Universidade Federal do ABC, Programa de Pós-Graduação em Nanociências e Materiais Avançados, 2016.<br>Este trabalho descreve o processo de sintese dos compostos YBa2(Cu1-xNix)3O7-¿Â (x = 0; 0,01; 0,02 e 0,04) com diferentes microestruturas. As amostras foram preparadas na forma de fios micrometricos e pos a partir do metodo de precursores polimericos e pelo metodo de eletrofiacao, respectivamente. No caso das amostras eletrofiadas, varios fatores foram avaliados como o solvente, o polimero, a viscosidade, tensao aplicada entre a agulha e a distancia anteparo e agulha. As melhores condicoes utilizadas para produzir os fios de YBa2(Cu1-xNix)3O7-¿Â foi a que utilizou como solvente uma solucao contendo acido propionico-metanol-acido acetico e o polimero PVP, que auxilia no processo de eletrofiacao. Apos a etapa de sintese, as condicoes de tratamento termico foram estimadas a partir de medidas de analise termogravimetrica e analise termica diferencial. A partir destes resultados as amostras na forma de fios e pos foram tratadas termicamente entre temperaturas variando de 350 a 925 ¿C em atmosfera de oxigenio. As propriedades fisicas das amostras foram caracterizadas por meio de microscopia eletronica de varredura (MEV), de difracao de raios X (DRX), medidas de magnetizacao e transporte eletrico. O estudo de formacao da fase cristalina YBCO tambem foi analisado por meio de DRX, que verificou os resultados previos da analise termica e indicou que as melhores caracteristicas cristalograficas foram alcancadas quando as amostras foram tratadas termicamente a temperaturas > 900 ¿C/O2. Analise dos dados de DRX indicaram que todas as amostras cristalizam em uma estrutura ortorrombica (grupo espacial Pmmm), no entanto a maioria das amostras apresentaram picos pertencentes a fases adicionais identificadas como o BaCuO2 e CuO. Apesar disto, todas foram analisadas pelo metodo de Rietveld, os dados estruturais obtidos revelaram valores de parametros de rede proximos aqueles listados na literatura. Os parameros a, b e c das amostras de fios, apresentaram valores ligeiramente menores dos aqueles obtidos para os pos, tambem notou-se uma clara reducao do volume da cela unitaria, o que acredita-se estar relacionado ao metodo de sintese. Os parametros de rede c apresentam valores proximos daqueles esperados para a estequiometria YBa2Cu3O7. As amostras na forma de fios tambem apresentaram uma menor proporcao de fase adicional. As caracteristicas microestruturais verificadas por meio de imagens de MEV revelou que as amostras produzidas a partir de fios de YBa2(Cu1-xNix)3O7 perderam a forma de fio quando tratadas termicamente, apenas a amostra com x = 0 mantem a forma de fio. Estas apenas mantem a forma se tratadas termicamente a tempos e temperaturas menores, mas nestas condicoes perdem suas caracteristicas supercondutoras. Por isso, as amostras submetidas a tratamentos termicos em temperaturas 925¿C/O2 foram caracterizadas por meio de medidas de magnetizacao e transporte eletrico. As caracterizacoes magneticas revelaram que as amostras preparadas a partir dos pos e fios apresentaram a transicao supercondutora em Tc ~ 90-92 K, sendo que a substituicao de Cu por de Ni promoveu a diminuicao de Tc. E importante observar que nos pos esta variacao foi de 92 para 88 K para amostras com x variando de 0 a 0,04, enquanto que para as amostras eletrofiadas esta variacao foi de 92 para 90,2 K. Nas medidas de transporte eletrico verificou-se que a substituicao Cu por Ni nao promoveu variacoes significativas de Tc que foi da ordem de 86-88 K tanto para as amostras obtidas de pos quanto de fio. De forma geral, este trabalho produziu pos e fios de YBCO com qualidade similar a descrita na literatura, a eletrofiacao tambem permitiu a fabricacao de amostras de YBa2(Cu1-xNix)3O7 (x= 0,01; 0,02 e 0,04) com caracteristicas estruturais e supercondutoras ligeiramente diferentes daquelas obtidas por meio de sintese convencional de po.<br>This work describes the synthesis process of YBa2(Cu1-xNix)3O7-ä (x = 0, 0.01, 0.02 and 0.04) compounds with different microstructure. Micrometric wires and powder samples were prepared through electrospinning and polymeric precursor method, respectively. In the case of electrospinning samples several factors were evaluated like the solvent, polymer, viscosity, electrode-needle applied voltage and the work distance. The best conditions to obtain YBa2(Cu1-xNix)3O7-ä wires were the solution with propionic acid- methanol-acetic acid solvents, and with PVP polymer, which usually helps the electrospinning process. After the synthesis, the heat treatment conditions were estimated through thermogravimetric analysis and differential thermal analysis. With these results, two baths of wires and powders samples were heat-treated in temperatures varying from 350 to 925 °C in oxygen atmosphere. All samples physical properties were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), magnetic and electrical transport properties. The YBCO crystalline phase formation was also analyzed through XRD, it showed a similar results than those from thermal analysis. These results showed that better crystallographic characteristics were reached when the samples were heat treated in temperatures > 900 °C/O2. XRD analysis indicated that all samples crystallized in orthorhombic structure (Pmmm space group symmetry), though most of them presents peaks of addition phases identified as BaCuO2 and CuO. Even though all samples were analyzed through the Rietveld method, such structural data revealed lattice parameters values close to those reported in literature. It should be noticed that a, b and c values of the wire samples were slight smaller than those obtained to the powder samples, also there is a clear reduction of the unit cell volume, which we believe is related to the synthesis method. The c lattice parameters present values close to those expected to the YBa2Cu3O7 stoichiometry. The wire samples also present a small amount of additional phases. Microstructural characteristics were verified through SEM images, which revealed that the YBa2(Cu1-xNix)3O7 wire samples lost the wire shape after the heat treatment, only the YBCO samples maintain the wire shape. Samples only maintain this shape when they were heat treated at smaller times and lower temperature, but in this case they lost their superconductor characteristic. So, only samples obtained through heat treatments at 925°C/O2 were characterized by magnetization and electric transport. Magnetic measurements of samples prepared from powder and wires revealed a superconductor transition temperature in Tc ~90-92K, whereas the Cu for Ni substitution promoted a decrease of Tc. It is important to notice that Tc values vary from 92 to 88 K for the powers samples with x varying from 0 to 0.04, though for electrospinning samples this variation is from 92 to 90.2 K. In electrical transport measurements it was verified that such Cu to Ni substitution do not promote significant variations in the Tc, which was of the order of 86-88 K for both samples produced by powder and wires. As a general remark, this work produced powders and wires of YBCO with similar quality than those described in literature. Also, the electrospinning allowed the preparation of YBa2(Cu1-xNix)3O7 (x= 0.01; 0.02 e 0.04) samples with structural and superconductors characteristic slightly different from those obtained through powder conventional synthesis.

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Flores, Ramos Luis Benjamín. "Cálculo y comparación de la estructura electrónica de los superconductores de alta temperatura crítica, YBa2Cu3O7 e YBa2Cu4O8." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2007. https://hdl.handle.net/20.500.12672/265.

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La superconductividad es el fenómeno que se da en algunos materiales metálicos y cerámicos. Se caracteriza por tener resistencia cero y ser diamagnéticos puros, presentándose a temperaturas menores a la temperatura critica. Existen dos tendencias principales para el estudio de los superconductores, teoría BCS y el método de ondas de espin. La razón del presente trabajo es analizar los cerámicos YBa2Cu3O7 (Y123) y YBa2Cu4O8 (Y124) en el estado fundamental (T igual a 0), paramagnético con el programa TB-LMTO-ASA y en forma complementaria, el programa “Augmented Spherical Wave” (ASW). Específicamente, se presentan cálculos de las bandas de energía, densidad de estados, densidad de carga total y parcial, la función de localización electrónica y la energía total. Adicionalmente se ha calculado la transferencia de carga entre los diferentes orbitales sobrelapados; calculo que no se ha encontrado en la literatura. Con el paquete ASW se calcula la COOP y COHP, que son la cantidad y energía de los estados híbridos bonding-antibonding. Con estos cálculos se intenta obtener información sobre el mecanismo de interacción y las condiciones que llevan a estos sistemas a un estado superconductor. La estructura de Y123 parte de un apilamiento de celdas perovskitas triple del tipo ABO3 con deficiencia de átomos de oxigeno, en donde se forma los planos CU2O en los limites de la celda central, siendo estos los responsables de las propiedades superconductoras, existiendo además cadenas de CuO. La estructura Y124 consiste en 2 celdas de Y123 aumentando su longitud en el eje c y en donde una de estas celdas es desplazado por ½ b del parámetro de red.<br>-- The superconductivity is the phenomenon that occurs in some metals and ceramic materials. It is characterized by zero resistance and pure diamagnetism, appearing at temperatures below the critical temperature. There are two major trends for the study of superconductors, BCS theory and the method of spin waves. The reason of this study is to analyze the ceramics YBa2Cu3O7 (Y123) and YBa2Cu4O8 (Y124) in the paramagnetic ground state (T igual a 0), with the computer program TB-LMTO-ASA and in a complementary manner, with the "Augmented Spherical Wave" (ASW) package. In detail, calculations of the electronic energy bands, full and partial density of states, electronic localization function and electronic total energy are presented. Additionally charge transfer between overlapping orbitals has been calculated, calculation that has not been found in the literature. With the package ASW the COOP and COHP was calculated, which are the amount of energy between the bonding and antibonding hybrids. With these calculations we are trying to obtain information on the mechanism of interaction and the conditions that lead in these systems to a superconducting state. The structure of Y123 parts from a stack of triple perovskite cells of the type ABO3 with a defficiency of oxygen atoms, which form the planes CuO2 in the limits of the central cell, and which are responsible for the superconducting properties. In addition there exist CuO chains. The structure of Y124 consists of two Y123 cells with increasing length in the c-axes, where one of these cells is moved by ½ of the parameter b.<br>Tesis

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Hänisch, Jens. "Strombegrenzende Mechanismen YBa2Cu3O7-[delta]-Dünnschichten und -Quasimultilagen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2005. http://nbn-resolving.de/urn:nbn:de:swb:14-1130772961636-06943.

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In this work, electrical transport properties and the maximum current carrying capability of YBa2Cu3O7-[delta] thin films and so called quasi-multilayers are investigated. These samples are prepared with pulsed laser deposition on single-crystalline substrates (SrTiO3) as well as on biaxially textured Ni tapes. The critical current density of coated conductors is limited by small-angle grain boundaries in low magnetic fields, but by the intra-grain pinning properties in higher magnetic fields. Accordingly, these investigations are divided into two parts: In the first part, the limitation of the critical current density by grain-boundaries and grain boundary networks is investigated with the main focus on the influence of geometrical factors such as the conductor width or the grain aspect ratio. In the second part, a possible enhancement of the critical current density due to different doping types (atomar doping using Zn and precipitate doping using BaMO3 where M is a transition metal) will be discussed. Here, not only the irreversibility field but also the pinning behaviour in very low magnetic fields is of interest to better understand the pinning mechanism of thin films<br>In der vorliegenden Arbeit werden elektrische Transporteigenschaften und die maximale Stromtragfähigkeit von YBa2Cu3O7-[delta]-Dünnschichten und -Schichtsystemen, die mit Hilfe der gepulsten Laserdeposition sowohl auf einkristallinem Substrat, SrTiO3, als auch auf biaxial texturierten Ni-Bändern deponiert wurden, untersucht. Da in kleinen Magnetfeldern Kleinwinkelkorngrenzen die kritische Stromdichte in Bandleitern begrenzen, in höheren jedoch die Pinningeigenschaften der Körner, gliedern sich diese Untersuchungen in zwei Teile: Im ersten wird die Limitierung der kritischen Stromdichte jc durch Korngrenzen und Korngrenzennetzwerke näher untersucht, wobei besonders Geometrieeinflüsse, wie die Leiterbahnbreite oder das Aspektverhältnis der Körner, interessieren. Im zweiten wird eine mögliche Erhöhung der kritischen Stromdichte durch verschiedene Dotierungen (atomare Dotierung: Zn, Ausscheidungsdotierung: BaMO3, M Metall) erörtert. Dabei ist nicht nur das Irreversibilitätsfeld interessant, sondern auch das Pinningverhalten in sehr kleinen Magnetfeldern, da so die Pinningmechanismen in Dünnschichten besser verstanden werden können

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Schneider, Thiago Luís. "PROCESSAMENTO E CARACTERIZAÇÃO DO COMPÓSITO SUPERCONDUTOR YBa2Cu3O7." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2014. http://tede2.uepg.br/jspui/handle/prefix/917.

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Made available in DSpace on 2017-07-21T19:26:09Z (GMT). No. of bitstreams: 1 Thiago Luis Schneider.pdf: 9685610 bytes, checksum: 1d228206aa0873ceb2084087b0fc033f (MD5) Previous issue date: 2014-03-28<br>Abstract Abstract<br>Resumo Resumo

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Thimont, Yohann. "ETUDE DES INHOMOGENEITES AFFECTANT LES CARACTERISTIQUES DES FILMS YBa2Cu3O7-d ET DES SUPERRESEAUX (YBa2Cu3O7-d /LaAlO3)n : CROISSANCE ET PROPRIETES." Phd thesis, Université de Caen, 2009. http://tel.archives-ouvertes.fr/tel-00546686.

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Ce manuscrit est consacré à l'étude des propriétés cristallographiques et physiques particulières aux films supraconducteurs constitués du composé YBa2Cu3O7 (YBCO) et aux superréseaux supraconducteur/isolant (YBCO/LAO)n. Le premier travail de cette thèse était d'optimiser la fabrication des films YBCO. Cette étape s'est traduite par la mise au point de méthodes d'analyses structurales et surtout par le développement d'un nouveau modèle physique. Ce dernier a permis de mettre en évidence une hétérogénéité des propriétés supraconductrices au sein des couches d'YBCO et d'extraire des profils de températures critiques dans l'épaisseur des films. Néanmoins, même après optimisation des films par le biais des paramètres de dépôt, nous n'avons pu obtenir une homogénéité de la température critique dans toute l'épaisseur des films. En suspectant les contraintes d'interfaces d'agir sur les propriétés physiques et cristallographiques, nous avons développé, à partir d'une nouvelle méthode de simulations des pics de diffraction X, la détermination d'un profil type de déformation des mailles YBCO le long de l'axe de croissance des films. Enfin, en ce qui concerne les superréseaux, nous avons constaté l'impact des épaisseurs respectives des couches sur les propriétés physiques et structurales et avons mis en évidences l'existence de défauts de différentes natures grâce à la microscopie électronique en transmission. Enfin l'application du modèle physique développé dans cette thèse nous a conduit à constater que seule une fraction d'une structure supraconductrice possédait effectivement cette propriété. Le point limitant ayant été identifié, il faut reconsidérer le processus de dépôt des films afin de s'affranchir de ce problème d'inhomogénéité au sein des films pour envisager la conception de systèmes électroniques complexes.

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Thimont, Yohann. "Etude des inhomogénéités affectant les caractéristiques des films YBa2Cu3O7-delta et des superréseaux (YBa2Cu3O7-delta /LaAIO3)n : croissance et propriétés." Caen, 2009. http://www.theses.fr/2009CAEN2052.

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Ce manuscrit est consacré à l’étude des propriétés cristallographiques et physiques particulières aux films supraconducteurs constitués du composé YBa2Cu3O7 (YBCO) et aux superréseaux supraconducteur/isolant (YBCO/LAO)n. Le premier travail de cette thèse était d’optimiser la fabrication des films YBCO. Cette étape s’est traduite par la mise au point de méthodes d’analyses structurales et surtout par le développement d’un nouveau modèle physique. Ce dernier a permis de mettre en évidence une hétérogénéité des propriétés supraconductrices au sein des couches d’YBCO et d’extraire des profils de températures critiques dans l’épaisseur des films. Néanmoins, même après optimisation des films par le biais des paramètres de dépôt, nous n’avons pu obtenir une homogénéité de la température critique dans toute l’épaisseur des films. En suspectant les contraintes d’interfaces d’agir sur les propriétés physiques et cristallographiques, nous avons développé, à partir d’une nouvelle méthode de simulations des pics de diffraction X, la détermination d’un profil type de déformation des mailles YBCO le long de l’axe de croissance des films. Enfin, en ce qui concerne les superréseaux, nous avons constaté l’impact des épaisseurs respectives des couches sur les propriétés physiques et structurales et avons mis en évidences l’existence de défauts de différentes natures grâce à la microscopie électronique à transmission. Enfin l’application du modèle physique développé dans cette thèse nous a conduit à constater que seule une fraction d’une structure supraconductrice possédait effectivement cette propriété. Le point limitant ayant été identifié, il faut reconsidérer le processus de dépôt des films afin de s’affranchir de ce problème d’inhomogénéité au sein des films pour envisager application dans la conception de systèmes électroniques complexes<br>This manuscript is devoted to the study of crystallographic and physical properties of superconductor YBCO thin films and superconductor/insulator (YBCO/LAO)n superlattices. The first stage of this work was to optimize the YBCO thin film deposition. Elaboration of a new physical model allows us to determine a critical temperature distribution inside the films thickness. Nevertheless, no homogeneous critical temperature inside the films can be obtained. This work shows that the interface strains modify the crystallographic and physical properties. We developed a new simulation method concerning the XRD peak shape analysis which allows us to determine YBCO cell deformation profile along the axis. About superlattices, effects of thickness on the physical and structural properties have been noticed. Transmission Electron Microscopy exhibits existence of structural defects in the films. Ending, the physical model proposed in the present work provides important informations regarding the magnetic interaction between two superconductor layers, which seems to limit application of these superlattices in the realization of complex electronic devices

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Ghamlouche, Hassan. "Effets thermoélectrique et thermomagnétique du YBa2Cu3O7-[delta] monocristallin." Sherbrooke : Université de Sherbrooke, 1998.

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Öktem, Bülent Abukay Doğan. "High temperature superconducting YBa2Cu3O7 thin flims and bolometers/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/fizik/T000555.pdf.

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Grigis, Christine. "Microscopie et spectroscopie électroniques. Application à YBa2Cu3O7-delta." Toulouse 3, 1997. http://www.theses.fr/1997TOU30193.

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La microscopie electronique en transmission (met) avec ses derniers developpements en imagerie haute resolution (mehr) et en spectroscopie de pertes d'energie d'electrons (eels) a ete exploitee et developpee pour l'etude de l'ordre structural, de la composition chimique et de l'etat electronique jusqu'a l'echelle atomique de composes y#1ba#2cu#3o#7#-#. Dans le cas de films minces elabores par depot chimique en phase vapeur a partir de composes organometalliques sur differents substrats et pour plusieurs conditions d'elaboration, l'etude de la topologie en met puis de l'arrangement atomique local en mehr a permis de visualiser directement l'ensemble des imperfections structurales et/ou chimiques au sein du film et a l'interface avec le substrat jusqu'a l'echelle de la longueur de coherence. Des correlations avec les grandeurs physiques importantes pour les applications a l'electronique supraconductrice ont ete proposees. En eels, nous avons developpe l'etude parallele et complementaire des signatures associees a l'excitation des electrons faiblement lies et des electrons des niveaux atomiques profonds. Nous avons mis au point un logiciel d'analyse a partir d'un traitement de kramers-kronig du signal afin d'acceder a des informations sur la densite d'etats joints entre les bandes de valence et de conduction. Avec une resolution d'analyse d'un electron-volt, nous avons analyse les structures fines pres des seuils d'excitation o-k et cu-l#2#,#3 et correle les resultats aux etats inoccupes du diagramme de structure de bande. Nous avons aussi exploite les signatures des processus d'interaction electronique en fonction de la quantite de mouvement transferee controlee dans l'experience eels. L'application a y#1ba#2cu#3o#7#-# a permis d'evaluer , notamment a partir de la signature du plasmon de volume, ainsi que de reveler l'anisotropie des distributions electroniques entre le plan (a,b) et la direction c de la structure orthorhombique de y#1ba#2cu#3o#7#-#, a partir de l'etude du seuil o-k.

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Books on the topic "YBa2Cu3O7"

1

Genc̨ten, Azmi. A 89Y NMR study of substitution for copper in YBa2Cu3O7-d and YBa2Cu4O8. typescript, 1992.

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Hooker, Matthew W. Nonaqueous slip casting of YBa2Cu3O7-x superconductive ceramics. Langley Research Center, 1994.

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Recker, Stephanie J. Pulsed laser deposition of YBa2Cu3O7-[delta]/PrBa2Cu3O7-[delta]. Brock University, Dept. of Physics, 1998.

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Kromann, Rasmus. Deposition, characterization, and electronic applications of YBa2Cu3O7 thin films. Risø National Laboratory, 1992.

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Tonkin, Bryan Anthony. Microwave properties of bulk and thick film YBa2Cu3O7-x superconductors. University of Portsmouth, 1995.

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Caves, Laurence Wilfred John. An Investigation of high Tc superconductivity in the doped YBa2Cu3O7 and Ln2CuO4 (Ln=La, Nd) systems by neutron scattering and nuclear magnetic resonance. typescript, 1992.

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Hooker, Matthew W. Room temperature degradation of YBa2Cu307x superconductors in varying relative humidity environments. Langley Research Center, 1993.

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Pells, G. P. Radiation Effects in YBa2Cu3O7 (Reports). AEA Technology Plc, 1989.

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E, Meola Joseph, Jenkins Kimberly A, and Lewis Research Center, eds. Study of deposition of YBa2Cu3O7-x on cubic zirconia. Lewis Research Center, 1989.

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Chen, Neng Yu. Normal-State Properties and Laser Deposition of Yba2Cu3O7-D Superconductor Thin Films. Delft Univ Pr, 1995.

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Book chapters on the topic "YBa2Cu3O7"

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Heyen, E. T., R. Liu, C. Thomsen, and M. Cardona. "Resonant Raman Scattering in YBa2Cu3O7, YBa2Cu3O6 and YBa2Cu4O8." In Springer Series in Solid-State Sciences. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84345-7_62.

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Ambrosch-Draxl, Claudia, P. Blaha, and K. Schwarz. "Electronic Structures of YBa2Cu4O8 Compared to YBa2Cu3O7." In Physics and Materials Science of High Temperature Superconductors, II. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2462-1_23.

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Triscone, J. M., O. Brunner, L. Antognazza, L. Miéville, and Ø. Fischer. "YBa2Cu3O7/PrBa2Cu3O7 Superlattices: Properties of Ultrathin YBa2Cu3O7 Layers." In Springer Series in Solid-State Sciences. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84865-0_10.

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Villars, P., K. Cenzual, R. Gladyshevskii, et al. "YBa2Cu3O7-δ tetragonal." In Landolt-Börnstein - Group III Condensed Matter. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-22847-6_642.

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Parans Paranthaman, Mariappan. "YBa2Cu3O7−x Coated Conductors." In High Temperature Superconductors. Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527631049.ch4.

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Aharoni, E., G. Koren, E. Polturak, D. Cohen, and E. Iskevitch. "In-Situ YBa2Cu3O7/SrTiO3/YBa2Cu3O7 a-b Plane Josephson Edge Junctions." In Superconducting Devices and Their Applications. Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77457-7_5.

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Yu, Jaejun, A. J. Freeman, and S. Massidda. "Bonds, Bands, Charge Transfer Excitations and Superconductivity: YBa2Cu3O7−δ vs. YBa2Cu3O6." In Novel Superconductivity. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1937-5_39.

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Goodyear, S. W., R. G. Humphreys, J. S. Satchell, et al. "Properties of YBa2Cu3O7 Thin Films." In Physics and Materials Science of High Temperature Superconductors. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0583-2_22.

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Yoshimura, Masahiro, Yōichi Ishikawa, Seiji Inoue, and Shigeyuki Sōmiya. "Surface Treatments of YBa2Cu3O7-X." In Sintering ’87. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1373-8_241.

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Steinfink, H., J. S. Swinnea, A. Manthiram, Z. T. Sui, and J. B. Goodenough. "Oxygen Stoichiometry of YBa2Cu3O7−x." In Novel Superconductivity. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1937-5_135.

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Conference papers on the topic "YBa2Cu3O7"

1

Mollatt, H. J. S., V. S. Dang, T. Qureishy, P. Mikheenko, and A. Crisan. "Flux Channeling in YBa2Cu3O7 Superlattices." In 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP). IEEE, 2018. http://dx.doi.org/10.1109/nap.2018.8915321.

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Atkinson, William A., and Jules P. Carbotte. "Chain-plane coupling in YBa2Cu3O7." In Photonics West '96, edited by Ivan Bozovic and Dirk van der Marel. SPIE, 1996. http://dx.doi.org/10.1117/12.241789.

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Bonn, D. A., J. E. Greedan, C. V. Stager, et al. "Far-infrared conductivity of yba2Cu3O7–y." In 1987 Twelth International Conference on Infrared and Millimeter Waves. IEEE, 1987. http://dx.doi.org/10.1109/irmm.1987.9126907.

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Gong, Ting, Y. Kostoulas, Li X. Zheng, et al. "Femtosecond optical nonlinearities in YBa2Cu3O7-x." In OE/LASE'93: Optics, Electro-Optics, & Laser Applications in Science& Engineering, edited by Timothy R. Gosnell, Antoinette J. Taylor, Keith A. Nelson, and Michael C. Downer. SPIE, 1993. http://dx.doi.org/10.1117/12.147068.

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Guarnieri, C. Richard, R. A. Roy, S. A. Shivashankar, et al. "Plasma spray deposited superconducting YBa2Cu3O7 films." In AIP Conference Proceedings Volume 165. AIP, 1988. http://dx.doi.org/10.1063/1.37095.

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Steinberg, Richard N., James D. McCambridge, Daniel E. Prober, and Bruce M. Guenin. "YBa2Cu3O7 films grown by metal cosputtering." In Superconductivity and its applications. AIP, 1992. http://dx.doi.org/10.1063/1.42073.

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Ruckman, M. W., S. M. Heald, D. Di Marzio, H. Chen, A. R. Moodenbaugh, and C. Y. Yang. "Reaction between YBa2Cu3O7−x and water." In Topical conference on high tc superconducting thin films, devices, and applications. AIP, 1989. http://dx.doi.org/10.1063/1.37928.

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Chew, Wilbert, A. Lance Riley, Daniel L. Rascoe, et al. "Coplanar waveguide microwave filter of YBa2Cu3O7." In Orlando '91, Orlando, FL, edited by Vernon O. Heinen and Kul B. Bhasin. SPIE, 1991. http://dx.doi.org/10.1117/12.45601.

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Verma, Sanjeev K., Anita Kumari, Anushri Gupta та B. D. Indu. "Anisotropy in superconducting gap in YBa2Cu3O7-δ". У DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5029106.

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Siders, Jennifer L. W., T. R. Gosnell, S. A. Trugman та A. J. Taylor. "Terahertz Emission from YBa2Cu3O7−δ thin films". У Ultrafast Electronics and Optoelectronics. OSA, 1997. http://dx.doi.org/10.1364/ueo.1997.uf11.

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Reports on the topic "YBa2Cu3O7"

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Osofsky, M. S., J. L. Cohn, E. F. Skelton, M. M. Miller, and T. A. Vanderah. Percolation Effects and Oxygen Inhomogeneities in YBa2Cu3O7-Delta Crystals. Defense Technical Information Center, 1991. http://dx.doi.org/10.21236/ada243281.

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Rouco, Victor, Teresa Puig, Anna Palau, et al. Effect of Ba2YTaO6 addition on the Irreversibility Line of YBa2Cu3O7 films. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1059399.

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Vanderah, T. A., C. K. Lowe-Ma, D. E. Bliss, M. W. Decker, and M. S. Osofsky. Growth of Near-Free-Standing YBa2Cu3O7-Type Crystals Using a Self- Decanting Flux Method. Defense Technical Information Center, 1991. http://dx.doi.org/10.21236/ada243221.

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Kim, Y. H., C. F. Foster, A. J. Heeger, S. Cox, and G. Stucky. Photoinduced Self-Localized Structural Distortions in YBa2Cu3O7-delta: Direct Evidence of Polarons or Bipolarons. Defense Technical Information Center, 1988. http://dx.doi.org/10.21236/ada196091.

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Cybart, Shane A., Steven M. Anton, Stehen M. Wu, John Clarke, and Robert C. Dynes. Very Large Scale Integration of Nano-Patterned YBa2Cu3O7-delta Josephson Junctions in a Two-Dimensional Array. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada522059.

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Hoffman, Jennifer E. Vortex Pinning in the High-Tc Superconductor YBa2Cu3O6+x. Defense Technical Information Center, 2009. http://dx.doi.org/10.21236/ada509088.

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Taylor, Benjamin, Teresa Emery, and Susan Berggren. Investigation of the Effects of Oxygen Content in YBa2Cu3Ox on the Depth and Profile of Direct Ion Milled Trenches. Defense Technical Information Center, 2014. http://dx.doi.org/10.21236/ada612269.

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