Perpendicular upper critical field of granular Pb films near the superconductor-to-insulator transition
Shih-Ying Hsu, J. M. Valles, Jr.
DOI 10.1103/PhysRevB.47.14334 · Physical Review B
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Abstract
We have measured the perpendicular upper critical field, Hc2(T), in ultrathin granular Pb films with normal-state sheet resistances, RN, that range from 10 Ω to 11 kΩ. The films with the highest RN are near the threshold for the superconductor-to-insulator (S-I) transition. We compare our results to calculations for granular superconductors and obtain values for the grain size and coherence length characteristic of a single grain. In addition, we present a measurement of the ratio of the intergrain Josephson-coupling energy to the single-grain condensation energy near the S-I transition in these films. The small value of this ratio, 0.05, at RN=11 kΩ is consistent with the picture that fluctuations in the phase of the order parameter dominate the S-I transition in these films.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.67 | Pressure not reported | midpoint |
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.79 | Pressure not reported | midpoint |
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.83 | Pressure not reported | midpoint |
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.88 | Pressure not reported | midpoint |
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.96 | Pressure not reported | midpoint |
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.05 | Pressure not reported | midpoint |
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