Evidence for an axial oxygen-centered lattice fluctuation associated with the superconducting transition in YBa sub 2 Cu sub 3 O sub 7

Journal Article · Mon Sep 24 04:00:00 EDT 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.65.1675· OSTI ID:6181166

Mustre de Leon, J; Conradson, S D; Batistic, I; Bishop, A R ^[1]

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1. Los Alamos National Laboratory, Los Alamos, NM (USA)

The axial oxygen contributions to the Cu {ital K}-edge, polarized, extended x-ray-absorption fine structure of YBa{sub 2}Cu{sub 3}O{sub 7} are analyzed from 10{le}{ital T}{le}105 K, using a novel approach in which the radial distribution function is directly calculated from model potentials. The best fit is obtained with a double-well potential with two nearly equally populated O(4) sites 0.13 A apart. The site separation decreases 0.02 A in a region near {ital T}{sub {ital c}}. This perturbation in the structure is accompanied by a large increase of the tunneling frequency of {similar to}80 K between the two wells, suggesting a coupling between superconducting fluctuations and nonlinear phonons.

• OSTI ID: 6181166
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 65:13; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
ANGULAR MOMENTUM OPERATORS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
DISTRIBUTION FUNCTIONS
ELASTICITY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
FINE STRUCTURE
FLUCTUATIONS
FUNCTIONS
HIGH-TC SUPERCONDUCTORS
LOW TEMPERATURE
MATHEMATICAL OPERATORS
MECHANICAL PROPERTIES
NONLINEAR PROBLEMS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PAULI SPIN OPERATORS
PHONONS
PHYSICAL PROPERTIES
POTENTIALS
QUANTUM OPERATORS
QUASI PARTICLES
SPECTRA
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNNEL EFFECT
ULTRALOW TEMPERATURE
VARIATIONS
VERY LOW TEMPERATURE
X-RAY SPECTRA
YTTRIUM COMPOUNDS
YTTRIUM OXIDES