Frequency-Domain Measurement of the Spin Imbalance Lifetime in Superconductors

Quay, C. H. L. and Dutreix, C. and Chevallier, D. and Bena, C. and Aprili, M. (2016) Frequency-Domain Measurement of the Spin Imbalance Lifetime in Superconductors. Physical Review B, 93 (22). 220501(R).

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Official URL: http://edoc.unibas.ch/53964/

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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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretical Nano/Quantum Physics (Klinovaja)
UniBasel Contributors:Chevallier, Denis
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 May 2017 10:50
Deposited On:22 Feb 2017 13:55

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