Spin dynamics in stoichiometric Ho2Ti2O7 probed by neutrons in the time domain and magnetometry in the frequency domain

ORAL

Abstract

We describe an experimental investigation of classical spin ice dynamics in a new class of high quality Ho2Ti2O7 single crystals. Employing a pump-probe method with microsecond time resolution, we have tracked neutrons diffracted from the (002) pinch point in response to an Oe range step changes in field applied along <110>. The relaxation time rises acutely from 10ms to over 10 ks upon cooling from 1.3K to 0.6K. Similar characteristic timescales were obtained from SQUID-based AC susceptibility measurements down to 1mHz on similar crystals. There are major quantitative differences between the present result and previously published works that we ascribe to our ultra-pure crystals. In addition, our simultaneous study of the Fourier-transform-related responses in time and frequency allows detailed mathematical scrutiny of the non-Debye relaxation process in spin ice.

*This work is supported by Gordon and Betty Moore Foundation under the EPIQS program GBMF no. 4532, and the Institute for Quantum Matter under DOE EFRC grant DE-SC0019331.

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Presenters

  • Yishu Wang

    • Johns Hopkins University

Authors

  • Yishu Wang

    • Johns Hopkins University

  • Timothy Reeder

    • Johns Hopkins University
    • Colorado State University

  • Jonas Kindervater

    • Johns Hopkins University
    • Physics Department, Technical University of Munich, Germany
    • Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University

  • Yoshitomo Karaki

    • University of the Ryukyus

  • Nicholas Maliszewskyj

    • National Institute of Standards and Technology

  • Sergiy Gladchenko

    • National Institute of Standards and Technology

  • Seyed Koohpayeh

    • Johns Hopkins University

  • Satoru Nakatsuji

    • Univ of Tokyo-Kashiwanoha
    • University of Tokyo
    • Institute for Solid State Physics, University of Tokyo
    • Institute for Solid State Physics, the University of Tokyo
    • Department of Physics, The University of Tokyo
    • Department of Physics, University of Tokyo
    • The Institute for Solid State Physics, The University of Tokyo
    • Institute for Solid State Physics, Univ of Tokyo-Kashiwanoha

  • Collin Leslie Broholm

    • The Johns Hopkins University
    • Johns Hopkins University
    • Physics and Astronomy, Johns Hopkins University
    • Physics, The Johns Hopkins University
    • Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University