Evidence for holes on oxygen sites in the high-Tc superconductors La2−xSrxCuO4 and YBa2Cu3O7−y
N. Nücker, J. Fink, J. C. Fuggle, P. J. Durham, W. M. Temmerman
DOI 10.1103/PhysRevB.37.5158 · 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
The local oxygen density of states of p symmetry at the Fermi level of La2−xSrxCuO4 and YBa2Cu3O7−y has been investigated as a function of x and y. Core-level excitations of oxygen 1s electrons into empty states by electron energy-loss spectroscopy has been used. Strong deviations from our calculations of the O 1s edges in the framework of a local density-functional model were observed in the superconducting and in the semiconducting compounds. They can be explained by taking into account on-site correlations of the Cu 3d electrons. The results indicate that for the superconductors, the density of states at the Fermi energy has predominantly oxygen 2p character. In this band the charge carriers in the superconducting compounds are holes. In the semiconducting compounds, the oxygen 2p band is probably completely filled.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Anomalous ultrasound propagation in the high-Tc superconductors: La1.8Sr0.2CuO4−y and YBa2Cu3O7−δ
similarity 0.96S. Bhattacharya et al.
Source status unknown — claims are unverified
Oxygen hole symmetry and banding in cuprate superconductors
similarity 0.96L. F. Mattheiss & D. R. Hamann
Source status unknown — claims are unverified
Topological defect condensation and high-temperature superconductivity
similarity 0.96A. Holz & Chang de Gong
Source status unknown — claims are unverified
Soft-x-ray emission spectroscopy study of La2CuO4 and three high-Tc superconductors
similarity 0.95V. Barnole et al.
Source status unknown — claims are unverified
Effect of Zn and Ni substitution on the local electronic structure of the YBa2Cu3O7 superconductor
similarity 0.95Ilya G. Kaplan et al.
Source status unknown — claims are unverified
Test of first-principle calculations of charge transfer and electron-hole distribution in oxide superconductors by precise measurements of structure factors
similarity 0.95Lijun Wu et al.
Source status unknown — claims are unverified