Frequency-domain measurement of the spin-imbalance lifetime in superconductors
C. H. L. Quay, C. Dutreix, D. Chevallier, C. Bena, M. Aprili
DOI 10.1103/PhysRevB.93.220501 · Physical Review B
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Abstract
We have measured the lifetime of spin imbalances in the quasiparticle population of a superconductor (τs) in the frequency domain. A time-dependent spin imbalance is created by injecting spin-polarized electrons at finite excitation frequencies into a thin-film mesoscopic superconductor (Al) in an in-plane magnetic field (in the Pauli limit). The time-averaged value of the spin-imbalance signal as a function of excitation frequency frf shows a cutoff at frf≈1/(2πτs). The spin-imbalance lifetime is relatively constant in the accessible ranges of temperatures, with perhaps a slight increase with increasing magnetic field. Taking into account sample thickness effects, τs is consistent with previous measurements and of the order of the electron-electron scattering time τee. Our data are qualitatively well described by a theoretical model taking into account all quasiparticle tunneling processes from a normal metal into a superconductor.
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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