Spin diffusion equation in superconductors in the vicinity of Tc

Takuya Taira, Masanori Ichioka, So Takei, Hiroto Adachi

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    8 Citations (Scopus)

    Abstract

    We microscopically derive the spin diffusion equation in an s-wave superconductor in the vicinity of the superconducting transition temperature Tc. Applying the general relation between the relaxation function and the response function to the present spin diffusion problem, we examine how the spin relaxation time and the spin diffusion coefficient are renormalized in the superconducting state. The analysis reveals that, below Tc, both the spin relaxation time and the spin diffusion coefficient are increased, resulting in an enhancement of the spin diffusion length. The present result may provide an explanation for the recent observation of an enhanced spin pumping signal below Tc in a Py/Nb/Pt system that is free from the coherence peak effect.

    Original languageEnglish
    Article number214437
    JournalPhysical Review B
    Volume98
    Issue number21
    DOIs
    Publication statusPublished - Dec 26 2018

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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