Electronic structure of high-Tc superconductors from soft-x-ray absorption
D. D. Sarma, O. Strebel, C. T. Simmons, U. Neukirch, G. Kaindl, R. Hoppe, H. P. Müller
DOI 10.1103/PhysRevB.37.9784 · Physical Review B
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Abstract
A series of high-Tc superconductors was studied using soft x-ray absorption spectroscopy at the Cu−LII,III thresholds. From a comparison with CuO and NaCuO2, it is shown that these superconductors contain mostly 3d9 and 3d9L (L=oxygen ligand hole) configurations in the ground state, with negligible amounts of Cu(III) 3d8. The spectral weights of the 3d9L components are found to be higher for the YBa2Cu3O7-type superconductors than for the La2CuO4-derived compounds and exceed the values expected from oxygen stoichiometry.
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. | 88 | Pressure not reported | zero_resistance |
| Y0.9Tb0.1Ba2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82.5 | Pressure not reported | zero_resistance |
| Y0.98Ce0.02Ba2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | zero_resistance |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | zero_resistance |
| La1.8Ba0.2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | zero_resistance |
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