The gap function in YBa[sub 2]Cu[sub 3]O[sub 7]

Conference · Sun Dec 20 04:00:00 EST 1998 · International Journal of Modern Physics B

OSTI ID:6443560

Zhao, G L; Bagayoko, D ^[1]

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1. Southern Univ. and A and M College, Baton Rouge, LA (United States). Physics Dept.

The authors have solved the four-dimensional anisotropic Eliashberg gap equation for YBa[sub 2]Cu[sub 3]O[sub 7] (YBCO) using the calculated electronic structure and the electron-phonon interaction matrix elements. The calculated [Tc] for YBCO is about 89 K for [mu][sup *] = 0.1. At or slightly above the transition temperature [Tc], the real part of the gap function [Delta]([kappa], 0), for all the [kappa]-points on the Fermi surface, becomes zero and the material is not superconducting. However, the energy gap function [Delta]([kappa], [omega]) is still nonzero for [omega] > 0 for some electronic states, leading to a pseudo-gap behavior in YBCO.

• OSTI ID: 6443560
• Report Number(s): CONF-980291--
• Conference Information: Journal Name: International Journal of Modern Physics B Journal Volume: 12:29-31
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
ELECTRON-PHONON COUPLING
ELECTRONIC STRUCTURE
ENERGY LEVELS
FERMI LEVEL
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TYPE-II SUPERCONDUCTORS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES