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Magnetic avalanches induced by magnetic sweep rate in a cluster glass

ORAL

Abstract

We study magnetic avalanches in La1-xSrxCoO3 and show that we can induce these avalanches for certain magnetic field sweep rates. La1-xSrxCoO3 with 0.1 ≤ x ≤ 0.15 are magnetic cluster glasses consisting of magnetic Co clusters seeded by Sr dopant atoms, surrounded by non-magnetic Co ions. For certain ranges of magnetic field sweep rates, large and random steps are observed in the magnetization, consistent with near-system-size magnetic avalanches. Beyond this range, magnetic field sweep rates produce smooth curves of magnetization vs magnetic field. We develop a model effectively showing that the magnetic interactions between the clusters are controlled by the magnetic field sweep rate.

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Presenters

  • Shalinee Chikara

    CMS, National High Magnetic Field Laboratory, Florida State University

Authors

  • Shalinee Chikara

    CMS, National High Magnetic Field Laboratory, Florida State University

  • Gia-Wei Chern

    Department of Physics, University of Virginia, Univ of Virginia, Physics, University of Virginia

  • Neil Harrison

    Los Alamos National Laboratory, NHMFL, Los Alamos National Laboratory, Los Alamos Natl Lab

  • John Singleton

    National High Magnetic Field Lab, Los Alamos, Los Alamos National Laboratory, NHMFL, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, NHMFL, Los Alamos National Lab, Los Alamos National Lab.

  • Leonardo Civale

    Los Alamos National Laboratory, Quantum Material Group, Los Alamos National Laboratory, Los Alamos Natl Lab

  • John Mitchell

    Argonne National Laboratory, Materials Science Division, Argonne National Laboratory, Argonne Natl Lab, Materials Science Division, Argonne National Lab, Material Science Division, Argonne National Lab

  • Vivien Zapf

    NHMFL, Los Alamos National Laboratory, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, National High Magnetic Field Lab, Los Alamos National Lab, Los Alamos Natl Lab