Nonmonotonic resistivity transitions in granular superconducting ceramics
A. Gerber, T. Grenet, M. Cyrot, J. Beille
DOI 10.1103/PhysRevB.43.12935 · Physical Review B
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Abstract
Nonmonotonic forms of resistive superconducting transition as a function of temperature and magnetic field have been observed in granular high-Tc ceramics of the electron-type family L2−xMxCuO4−y. The behavior is compared with that of low-temperature granular superconductors and is treated by the conventional terms of the energy gap and Josephson and quasiparticle tunnelings. The values of the intragranular upper critical field Hc2 perpendicular to the a-b plane of Sm-Ce-Cu-O are extracted. We find evidence for the appearance of superconductivity in individual grains at temperatures significantly higher than the resistance onset temperature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sm1.85Ce0.15CuO3.98 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
| Sm1.85Ce0.15CuO3.97 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
| Nd1.85Ce0.15CuO3.98 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
| DyBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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