Electronic structure changes and superconductivity in YBa2Cu3O7−x
D. H. Kim, D. D. Berkley, A. M. Goldman, R. K. Schulze, M. L. Mecartney
DOI 10.1103/PhysRevB.37.9745 · Physical Review B
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Abstract
X-ray photoelectron spectroscopy (XPS) studies were performed on bulk polycrystalline samples of YBa2Cu3O7−x as a function of temperature through the superconducting transition. With decreasing temperature, clear changes were observed in the photoelectron spectrum which can be interpreted as signatures of the Cu3+ and perhaps the Cu1+ oxidation states, in addition to the usual Cu2+ state. These changes were not observed in samples which had been rendered nonsuperconducting by baking in vacuum. These results may have implications for the mechanism for superconductivity in this high-Tc compound.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure not reported | onset |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | zero_resistance |
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