Superconducting shells in ceramic YBa2Cu3O7
D. S. Ginley, E. L. Venturini, J. F. Kwak, R. J. Baughman, B. Morosin, J. E. Schirber
DOI 10.1103/PhysRevB.36.829 · Physical Review B
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Abstract
We demonstrate that, even in single-phase ceramic YBa2Cu3O7, superconductivity occurs in only thin shells surrounding normal grains. The shells comprise no more than 25 vol% of the material, independent of preparation technique and subsequent processing. This conclusion is based on comparison of magnetic flux exclusion, Meissner and resistivity data for bulk, compacted, and ground materials. We show that these data depend on the sample microstructure, but do not arise from pinning effects.
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. | 93 | Pressure not reported | onset |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | zero_resistance |
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