Self-induced magnetic flux structure in magnetic superconductor

ORAL

Abstract

We image the temperature evolution of the distribution of the magnetic induction in single crystals of the magnetic superconductor EuRbFe4As4. In contrast to the traditional Meissner flux expulsion, the samples cooled in constant magnetic fields show unusual vortex patterns revealing a strong enhancement of the internal magnetic flux density upon approaching the magnetic transition temperature. The observed patterns demonstrate a cooperative response of the magnetic subsystem, which acts as an internal pump of the magnetic flux, and the superconducting system, which controls the delivery of vortices into the bulk of the sample. We suggest possible current distributions responsible for the observed flux patterns.

*The work was supported by the U.S. Department of Energy, Office of Science, Materials Sciences and Engineering Division.

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Presenters

  • Vitalii Vlasko-Vlasov

    • Materials Sciences Division, Argonne National Laboratory
    • Argonne National Laboratory

Authors

  • Vitalii Vlasko-Vlasov

    • Materials Sciences Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Alexei E Koshelev

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Jinke Bao

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Duck Young Chung

    • Materials Science Division, Argonne National Laboratory
    • Materials Science Division, Argonne National Lab
    • Argonne National Laboratory

  • Mercouri Kanatzidis

    • Department of Chemistry, Northwestern University
    • Chemistry, Northwestern University
    • Chemistry, Northwestern University, Evanston, IL 60208
    • Northwestern University
    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Ulrich Welp

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Wai-Kwong Kwok

    • Argonne National Laboratory
    • Materials Science Division, Argonne National Laboratory
    • Material Science Division, Argonne National Laboratory
    • Materials Sciences Division, Argonne National Laboratory
    • Argonne National Lab