Observation of granular superconductivity in polycrystalline Sm2−xCexCuO4−y
H. A. Blackstead, R. F. Jardim, P. Beeli, D. B. Pulling, A. K. Heilman
DOI 10.1103/PhysRevB.57.3683 · Physical Review B
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Abstract
Using field-dependent (0<~B<~7T) noncontact rf surface-resistance measurements, we confirm the onset of granular superconductivity in the high-temperature superconductor Sm2−xCexCuO4−y, 0.15<~x<~0.18 at temperatures for which there is no evidence for a bulk Meissner effect. The surface-resistance data are described with an extended form of the Coffey-Clem theory. For the samples with x=0.15, these measurements also indicate that near the mean-field critical temperature Tc, −dBc2c/dT≅0.38T/K, for B∥c axis.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sm2-xCexCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | onset |
| Sm2-xCexCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | onset |
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