Electronic structure and electron-phonon coupling in layered copper oxide superconductors

✍ Scribed by Warren E. Pickett; Ronald E. Cohen; Henry Krakauer

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 523 KB
• Volume: 169
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(91)90206-t

✦ Synopsis

The invited talk was given by W.E. Pickett. Experimental data on the layered Cu-0 superconductors seem more and more to reflect normal Fermi-liquid behavior and substantial correspondence with band structure predictions. Recent self-consistent, microscopic band theoretic calculations of the electronic structure, lattice instabilities, phonon frequencies, and electron-phonon coupling characteristics and strength for La,CuO, and YBa,Cu,O, are reviewed. A dominant feature of the coupling is a novel Madelung-like contribution which would be screened out in high density of states superconductors but survives in cuprates because of weak screening.

Local density functional theory correctly predicts the instability of (La, Ba),CuO, to both the lowtemperature orthorhombic phase (below room temperature) and the lower-temperature tetragonal phase (below 50 K).