The axial oxygen atom and superconductivity in YBa sub 2 Cu sub 3 O sub 7
- Los Alamos National Lab., NM (USA)
Changes in the copper K-edge x-ray absorption spectrum of YBa{sub 2}Cu{sub 3}O{sub 7} across the critical temperature indicate that, accompanying the superconducting transition, the mean square relative displacement of some fraction of the Cu2-O4 bonds becomes smaller or more harmonic (or both), that there may be a slight increase in the associated Cu1-O4 distance, and that electronic states involving these atom pairs become more atomic-like. If there is an association between the superconductivity and this lattice instability, then the bridging axial oxygen is of central importance in determining the high transition temperature of YBa{sub 2}Cu{sub 3}O{sub 7}. Because this structural perturbation will affect the dynamic polarizability of the copper oxygen sublattice, it is consistent with an excitonic pairing mechanism in these materials. 36 refs., 4 figs.
- DOE Contract Number:
- AC03-82ER13000
- OSTI ID:
- 6973068
- Journal Information:
- Science (Washington, D.C.); (USA), Journal Name: Science (Washington, D.C.); (USA) Vol. 243:4896; ISSN SCIEA; ISSN 0036-8075
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
COPPER COMPOUNDS
CRYSTAL STRUCTURE
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
INFORMATION
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS