Evidence of conventional superconductivity in La-Ba-Cu-O compounds

Journal Article · Fri May 01 00:00:00 EDT 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.35.7252· OSTI ID:6046924

Pickett, W E; Krakauer, H; Papaconstantopoulos, D A; Boyer, L L

First-principles methods are applied to investigate the electronic structure and electron-phonon coupling in the end-point members (x = 0 and x = 1) of the new high-transition-temperature (T/sub c/) superconductor La/sub 2-//sub x/Ba/sub x/CuO/sub 4/ and their counterpart cubic perovskites La/sub 1-//sub x/Ba/sub x/CuO/sub 3/. Alloying with Ba (x = 1) induces non-rigid-band changes in the Cu and O density of states, but the Cu charge state changes rather little. The calculated McMillan-Hopfield parameter eta coupled with soft phonon modes provides a strong electron-phonon interaction lambdaapprox.2.5 that can account for the high T/sub c/ of approx.30--40 K in these systems.

• Research Organization: Naval Research Laboratory, Washington, D.C. 20375-5000
• OSTI ID: 6046924
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:13; ISSN PRBMD
• 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
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
COPPER COMPOUNDS
CUPRATES
ELECTRON-PHONON COUPLING
ELECTRONIC STRUCTURE
ENERGY-LEVEL DENSITY
LANTHANUM COMPOUNDS
MUFFIN-TIN POTENTIAL
OXYGEN COMPOUNDS
PEROVSKITES
PHONONS
PHYSICAL PROPERTIES
POTENTIALS
QUASI PARTICLES
RARE EARTH COMPOUNDS
SELF-CONSISTENT FIELD
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE