Quasiparticle spectrum in superconducting YBa{sub 2}Cu{sub 3}O{sub 7}
Journal Article
·
· Physical Review, B: Condensed Matter
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001 (United States)
We have used the real-axis Eliashberg equations for an anisotropic superconductor to study the quasiparticle density of states of superconducting YBa{sub 2}Cu{sub 3}O{sub 7} in a temperature range from 0 up to 120 K. A first-principles electronic structure and a nonorthogonal tight-binding method was used to calculate the electron-phonon interaction. The large variation we found in gap energies for different bands and directions on the Fermi surface and strong frequency dependence of the gap explains broad features seen in the low temperature tunneling density of states as well as structure seen close to {ital T}{sub {ital c}}. Above 50 K we have evidence for a gapless superconductor with {ital s}-wave pairing.
- OSTI ID:
- 147782
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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