Dynamical torques from Shiba states in s-wave superconductors

ORAL

Abstract

Magnetic impurities inserted in a s-wave superconductor give rise to spin-polarized in-gap states called Shiba states. We study the back-action of these induced states on the dynamics of the classical moments. We show that the Shiba state pertains to both reactive and dissipative torques acting on the precessing classical spin that can be detected through ferromagnetic resonance measurements.
Moreover, we highlight the influence of the bulk states as well as the effect of the finite linewidth of the Shiba state on the magnetization dynamics. Finally, we demonstrate that the torques are a direct measure of the even and odd frequency triplet pairings generated by the dynamics of the magnetic impurity. Our approach offers non-invasive alternative to the STM techniques used to probe the Shiba states.

*This work was supported by the International Centre for Interfacing Magnetism and Superconductivity with Topological Matter project, carried out within the International Research Agendas program of the Foundation for Polish Science co-financed by the European Union under the European Regional Development Fund.

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Presenters

  • Archana Mishra

    • Institute of Physics Polish Academy of Sciences

Authors

  • Archana Mishra

    • Institute of Physics Polish Academy of Sciences

  • So Takei

    • Queens College CUNY
    • Queens College
    • The Graduate Center, City University of New York

  • Pascal Simon

    • University of Paris-Saclay
    • Universite Paris-Saclay
    • Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides
    • Laboratoire de Physiques des Solides, Universite Paris-Saclay, CNRS

  • Mircea Trif

    • Institute of Physics Polish Academy of Sciences