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

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

doi:10.1103/PhysRevB.35.7252

← Back to search

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

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

DOI 10.1103/PhysRevB.35.7252 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

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 (Tc) superconductor La2−xBaxCuO4 and their counterpart cubic perovskites La1−xBaxCuO3. 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 η coupled with soft phonon modes provides a strong electron-phonon interaction λ∼2.5 that can account for the high Tc of ∼30–40 K in these systems.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown
La2-xBaxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	onset