Unconventional superconducting granularity of the Y1−xPrxBa2Cu3O7−δ compound
F. M. Barros, P. Pureur, J. Schaf, F. W. Fabris, V. N. Vieira, A. R. Jurelo, M. P. Cantão
DOI 10.1103/PhysRevB.73.094515 · Physical Review B
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Abstract
We report on fluctuation magnetoconductivity and magnetic irreversibility of Y1−xPrxBa2Cu3O7−δ single crystals and a polycrystalline sample. Although our samples are all single phase (orthorhombic) and the single crystals show no sign of structural inhomogeneity, all the samples exhibit two close and sharp genuine superconducting transitions. On the other hand, while the resistive transition of the polycrystalline sample exhibits in addition a coherence transition characteristic of a granular superconductor and the magnetic irreversibility displays the signature of the intergrain flux dynamics, the single crystals show no sign of these features. In view of these facts, we conclude that the well characterized split superconducting transition must result from a peculiar phase separation related with oxygen doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y0.95Pr0.05Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.3 | Pressure not reported | onset |
| Y0.95Pr0.05Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.2 | Pressure not reported | onset |
| Y0.76Pr0.24Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 70.4 | Pressure not reported | onset |
| Y0.76Pr0.24Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 69.2 | Pressure not reported | onset |
| Y0.85Pr0.15Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | onset |
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