Spin dynamics in stoichiometric Ho<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> 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