A length scale for the superconducting Nernst signal above T${}_c$ in Nb${}_{0.15}$Si${}_{0.85}$

Abstract

We present a study of the Nernst effect in amorphous superconducting thin films of Nb${}_{0.15}$Si${}_{0.85}$. The field dependence of the Nernst coefficient above T${}_c$ displays two distinct regimes separated by a field scale set by the Ginzburg-Landau correlation length. A single function $F(\xi )$, with the correlation length as its unique argument set either by the zero-field correlation length (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 ($30\times T_c$) and field ($4\times B_{c2}$) range is exclusively generated by short-lived Cooper pairs.

arXiv comment4 pages, 4 figures

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