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Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet

Author

Listed:
  • Seung-Hwan Do

    (Materials Science and Technology Division, Oak Ridge National Laboratory)

  • Hao Zhang

    (Materials Science and Technology Division, Oak Ridge National Laboratory
    University of Tennessee)

  • Travis J. Williams

    (Neutron Scattering Division, Oak Ridge National Laboratory)

  • Tao Hong

    (Neutron Scattering Division, Oak Ridge National Laboratory)

  • V. Ovidiu Garlea

    (Neutron Scattering Division, Oak Ridge National Laboratory)

  • J. A. Rodriguez-Rivera

    (University of Maryland
    NIST Center for Neutron Research)

  • Tae-Hwan Jang

    (MPPHC-CPM, Max Planck POSTECH/Korea Research Initiative)

  • Sang-Wook Cheong

    (MPPHC-CPM, Max Planck POSTECH/Korea Research Initiative
    Rutgers University)

  • Jae-Hoon Park

    (MPPHC-CPM, Max Planck POSTECH/Korea Research Initiative
    Pohang University of Science and Technology)

  • Cristian D. Batista

    (University of Tennessee)

  • Andrew D. Christianson

    (Materials Science and Technology Division, Oak Ridge National Laboratory)

Abstract

An ongoing challenge in the study of quantum materials, is to reveal and explain collective quantum effects in spin systems where interactions between different modes types are important. Here we approach this problem through a combined experimental and theoretical study of interacting transverse and longitudinal modes in an easy-plane quantum magnet near a continuous quantum phase transition. Our inelastic neutron scattering measurements of Ba2FeSi2O7 reveal the emergence, decay, and renormalization of a longitudinal mode throughout the Brillouin zone. The decay of the longitudinal mode is particularly pronounced at the zone center. To account for the many-body effects of the interacting low-energy modes in anisotropic magnets, we generalize the standard spin-wave theory. The measured mode decay and renormalization is reproduced by including all one-loop corrections. The theoretical framework developed here is broadly applicable to quantum magnets with more than one type of low energy mode.

Suggested Citation

  • Seung-Hwan Do & Hao Zhang & Travis J. Williams & Tao Hong & V. Ovidiu Garlea & J. A. Rodriguez-Rivera & Tae-Hwan Jang & Sang-Wook Cheong & Jae-Hoon Park & Cristian D. Batista & Andrew D. Christianson, 2021. "Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet," Nature Communications, Nature, vol. 12(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25591-7
    DOI: 10.1038/s41467-021-25591-7
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    Cited by:

    1. Shunsuke Hasegawa & Hodaka Kikuchi & Shinichiro Asai & Zijun Wei & Barry Winn & Gabriele Sala & Shinichi Itoh & Takatsugu Masuda, 2024. "Field control of quasiparticle decay in a quantum antiferromagnet," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    2. Yoshito Watanabe & Atsushi Miyake & Masaki Gen & Yuta Mizukami & Kenichiro Hashimoto & Takasada Shibauchi & Akihiko Ikeda & Masashi Tokunaga & Takashi Kurumaji & Yusuke Tokunaga & Taka-hisa Arima, 2023. "Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    3. Tao Hong & Tao Ying & Qing Huang & Sachith E. Dissanayake & Yiming Qiu & Mark M. Turnbull & Andrey A. Podlesnyak & Yan Wu & Huibo Cao & Yaohua Liu & Izuru Umehara & Jun Gouchi & Yoshiya Uwatoko & Masa, 2022. "Evidence for pressure induced unconventional quantum criticality in the coupled spin ladder antiferromagnet C9H18N2CuBr4," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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