Nernst effect beyond the coherence critical field of a nanoscale granular superconductor
S. Lerer, N. Bachar, G. Deutscher, Y. Dagan
DOI 10.1103/PhysRevB.90.214521 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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