Nernst effect beyond the coherence critical field of a nanoscale granular superconductor

S. Lerer, N. Bachar, G. Deutscher, Y. Dagan

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We report measurements of the Nernst effect and of the magnetoresistance of granular aluminum films near the metal-to-insulator transition. These films show sharp transitions as a function of temperature and magnetic field. At low temperatures the Nernst signal displays a sharp peak at a field where more than 90% of the normal-state resistance has been restored, suggesting a transition involving entropy transport after superconducting coherence has been destroyed. At temperatures higher than the critical temperature the fluctuation paraconductivity scales with the Nernst signal, in agreement with a description in terms of fluctuations of the order parameter.

Original languageEnglish
Article number214521
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number21
DOIs
StatePublished - 29 Dec 2014
Externally publishedYes

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