Oxygen diffusion in superconducting YBa2Cu3O7−δ oxides in ambient helium and oxygen
K. N. Tu, C. C. Tsuei, S. I. Park, A. Levi
DOI 10.1103/PhysRevB.38.772 · Physical Review B
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Abstract
In situ resistivity measurement has been used to monitor diffusion of oxygen in and out of bulk and polycrystalline YBa2Cu3O7−δ in ambient O2 and He atmospheres. The out-diffusion of oxygen from the oxide is found to be independent of δ and its rate is surface-reaction limited with an activation energy of 1.7 eV. The in-diffusion depends strongly on δ; the activation energies of the process at δ≅0 and δ=0.38 are 1.1 and 0.48 eV, respectively. The latter is taken to be the activation energy of motion and the former, the activation energy of diffusion. On the basis of the kinetic and published structural information, we have proposed a defect mechanism in the CuO plane for the anisotropic diffusion of oxygen in the oxide.
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 not reported | unknown |
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