Length scale for the superconducting Nernst signal above Tc in Nb0.15Si0.85
A. Pourret, H. Aubin, J. Lesueur, C. A. Marrache-Kikuchi, L. Bergé, L. Dumoulin, K. Behnia
DOI 10.1103/PhysRevB.76.214504 · Physical Review B
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Abstract
We present a study of the Nernst effect in amorphous superconducting thin films of Nb0.15Si0.85. The field dependence of the Nernst coefficient above Tc displays two distinct regimes separated by a field scale set by the Ginzburg-Landau correlation length (CL). A single function F(ξ), with the CL as its unique argument set either by the zero-field CL (in the low magnetic field limit) or by the magnetic length (in the opposite limit), describes the Nernst coefficient. We conclude that the Nernst signal observed on a wide temperature (30×Tc) and field (4×Bc2) range is exclusively generated by short-lived Cooper pairs.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb0.15Si0.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.165 | Pressure not reported | midpoint |
| Nb0.15Si0.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.38 | Pressure not reported | midpoint |
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