Evidence for homogeneous superconducting grains in high-Tc oxides
J. F. Kwak, E. L. Venturini, P. J. Nigrey, D. S. Ginley
DOI 10.1103/PhysRevB.37.9749 · Physical Review B
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Abstract
We present direct and magnetization critical current data on ceramic YBa2Cu3O7−δ which indicate that the "homogeneous superconducting regions" are much larger than the penetration depth and in fact are grain size. Thus, the current-limiting Josephson junctions in the high-Tc oxide ceramics must be intergranular rather than intragranular. In light of these findings, we believe that a high density of twin boundaries probably enhances the intragranular critical current.
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. | 93 | Pressure not reported | onset |
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