Symmetry of holes in high-Tc superconductors
N. Nücker, H. Romberg, X. X. Xi, J. Fink, B. Gegenheimer, Z. X. Zhao
DOI 10.1103/PhysRevB.39.6619 · Physical Review B
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
High-energy electron energy-loss spectroscopy in transmission has been used to obtain information on the symmetry of unoccupied electronic states in the new high-Tc superconductors. In particular, for YBa2Cu3O7 and Bi2Sr2CaCu2O8, the O 1s and Cu 2p absorption edges have been measured for momentum transfer parallel and perpendicular to the a,b plane. Both σ and in-plane π holes on O, formed upon doping, are compatible with our experimental results. For YBa2Cu3O7, in both cases, holes must be in the planes and in the ribbons. Out-of-plane π holes can be excluded for YBa2Cu3O7 and Bi2Sr2CaCu2O8. In the undoped and doped compounds, the unoccupied states on the Cu sites have & symmetry. There is an admixture of about 10% of lower-lying states probably with & symmetry.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure not reported | unknown |
Similar papers
Evidence of redistribution of the itinerant holes below Tc in Ba2Sr2CaCu2O8 superconductors: A polarized x-ray-absorption study
similarity 0.95N. L. Saini et al.
Source status unknown — claims are unverified
Large pinning efficiency of orthogonal columnar defects in a weakly anisotropic high-Tc superconductor
similarity 0.95S. Hébert et al.
Source status unknown — claims are unverified
Magnetic properties of Y-Ba-Cu-O superconductors
similarity 0.95T. R. McGuire et al.
Source status unknown — claims are unverified
Magnetism and critical fields in the high-Tc superconductors YBa2Cu3O7−xSx(x=0, 1): An ESR study
similarity 0.95Carlos Rettori et al.
Source status unknown — claims are unverified
Magnetization of a superconductor: Results from the critical-state model
similarity 0.95Z. Koziol/ et al.
Source status unknown — claims are unverified
Symmetry of Hole States in Superconducting Oxides: Correlation with Tc
similarity 0.95C. Di Castro et al.
Source status unknown — claims are unverified