Vortex-glass transitions in low-Tc superconducting Nb thin films and Nb∕Cu superlattices
J. E. Villegas, J. L. Vicent
DOI 10.1103/PhysRevB.71.144522 · Physical Review B
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Abstract
We have studied electrical transport properties in the mixed state of superconducting Nb thin films and Nb∕Cu superlattices. Using a scaling analysis of I–V characteristics, we have found evidence of a vortex-glass transition in these low-Tc systems. We have investigated the dimensionality of the glass transition in both the artificially anisotropic Nb∕Cu superlattices and Nb thin films. The latter show up a three-dimensional glass transition, while for Nb∕Cu superlattices we have found a dimensional crossover from a quasi-two dimensional to a pure two dimensional glass transition, which is governed by the coupling of Nb layers across Cu ones. The length and energy scales relevant to these behaviors will be discussed, and compared to that of high-Tc systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.264 | Pressure not reported | unknown |
| Nb3.4nm/Cu2.5nm Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.96 | Pressure not reported | unknown |
| Nb6nm/Cu27nm Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.8 | Pressure not reported | unknown |
| Nb13nm/Cu27nm Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.85 | Pressure not reported | unknown |
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