Metal-insulator transition and superconductivity in Y1Ba2Cu3O7−x
R. C. Budhani, Sing-Mo H. Tzeng, R. F. Bunshah
DOI 10.1103/PhysRevB.36.8873 · Physical Review B
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Abstract
The oxygen concentration in the Y1Ba2Cu3O7−x superconducting compound has been changed by subjecting it to rapid quenching from temperatures in the range 500- 1000°C. The lower oxygen concentration destroys the superconductivity, causes removal of the orthorhombic distortion in the perovskite structure and results in a metal-insulator (M−I) transition. The presence of variable range hopping conductivity and thermopower in the insulating regime strongly suggests that the M−I transition is of Anderson type. The results in general are understood in terms of the relative overlap between dz2 and dx2−y2 components of the eg band of the octahedrally coordinated copper atoms.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1Ba2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | onset |
| Y1Ba2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | zero_resistance |
| Y1Ba2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | zero_resistance |
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