Direct measurement of quasiparticle evanescent waves in a dirty superconductor
J. Y. Gu, J. A. Caballero, R. D. Slater, R. Loloee, W. P. Pratt, Jr.
DOI 10.1103/PhysRevB.66.140507 · Physical Review B
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Abstract
We have used a perpendicular-current spin-polarization detector, in the form of a Permalloy-based exchange-biased spin valve, to measure the length scale for penetration of quasiparticles through superconducting-Nb thin films under diffusive transport conditions. In the low-temperature limit, this penetration length is ∼16nm, comparable to the estimated “dirty-limit” zero-temperature coherence length of our Nb films.
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. | 9.1 | Pressure not reported | unknown |
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