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.

–

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