Thermal recovery of oxygen-deficient superconducting YBa2Cu3O7−δ oxides in ambient oxygen
K. N. Tu, N. C. Yeh, S. I. Park, C. C. Tsuei
DOI 10.1103/PhysRevB.38.5118 · Physical Review B
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Abstract
We have annealed the oxygen-deficient ceramic oxide YBa2Cu3O7−δ, where δ=0.4, in ambient oxygen to obtain in-diffusion of oxygen. In situ resistivity measurements were used to monitor annealing at constant heating rates between room temperature and 570 °C. The resistivity curve showed a maximum and a minimum. The temperatures where the maximum and the minimum were observed change with heating rate. By measuring their dependence on heating rate, which was varied from 15 to 0.1 °C/min, we have determined the activation energy of oxygen diffusion in the oxide (δ=0) to be 1.35±0.10 eV. The in-diffusion is limited by a near-surface layer which requires the measured activation energy for oxygen to diffuse through it.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure unresolved | unknown |
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