Journal ArticleDOI
Structural and superconducting properties of orthorhombic and tetragonal YBa2Cu
James D. Jorgensen,B. W. Veal,W. K. Kwok,G. W. Crabtree,A. Umezawa,L.J. Nowicki,Arvydas P. Paulikas +6 more
TLDR
Etude realisee sur une large plage de compositions, Tc decroit lentement quand x croit, et atteint 0 a la transition d'orthorhombique a tetragonal.Abstract:
The structural and superconducting properties of orthorhombic and tetragonal $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}x}$ have been determined for a wide range of stoichiometries ($0.3lxl0.7$). In the orthorhombic phase, ${T}_{c}$ decreases smoothly as $x$ increases and reaches zero at the orthorhombic-to-tetragonal transition. Tetragonal $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}x}$ is not superconducting at any stoichiometry. This systematic depression of ${T}_{c}$ is correlated with the decrease in the oxygen content which alters the electronic structure of the Cu-O networks.read more
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Electronic structure of the high-temperature oxide superconductors
TL;DR: In this paper, a review of the results of the density-functional type of electronic structure calculations is presented, and their results are compared with the relevant experimental data, showing that the important electronic states are dominated by the copper and oxygen orbitals, with strong hybridization between them.
Journal ArticleDOI
Structural anomalies, oxygen ordering and superconductivity in oxygen deficient Ba2YCu3Ox
Robert J. Cava,A.W. Hewat,Elizabeth A. Hewat,Bertram Batlogg,M. Marezio,M. Marezio,Karin M. Rabe,J. J. Krajewski,W. F. Peck,L. W. Rupp +9 more
TL;DR: In this article, the authors report the characterization of series of oxygen deficient Ba2YCu3Ox samples for 7 ≥ x ≥ 6 prepared by Zr gettered annealing at 440°C.
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Structural anomalies at the disappearance of superconductivity in Ba2YCu3O7−δ: Evidence for charge transfer from chains to planes
TL;DR: The role of secondary structural elements in the layered copper-oxide high-T c superconductors has been investigated in this paper, showing that superconductivity is lost due to a charge redistribution from the copper-oxygen chains to the copperoxygen planes.
Journal ArticleDOI
Lattice vibrations in high-Tc superconductors: Optical spectroscopy and lattice dynamics☆
TL;DR: In this paper, Raman and IR-measurements on the high-T c material series La 2 CuO 4 and YBa 2 Cu 3 O 7 are reviewed, focusing on lattice vibrations in these superconducting systems, on impurity phases, the influence of oxygen stoichiometry and element substitution.
Journal ArticleDOI
Crystal structures of high- T c oxides
Klaus Yvon,M. François +1 more
TL;DR: A comprehensive review of structure work on high-Tc oxides as reported during the years 1987 and 1988 is given in this paper, where 13 structures are refined from X-ray single-crystal and/or neutron powder diffraction data.