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Manifestation of magnetic quantum fluctuations in the dielectric properties of a multiferroic

Author

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  • Jae Wook Kim

    (CeNSCMR, Seoul National University
    Present address: NHMFL, LANL, Los Alamos, New Mexico 87545, USA.)

  • Seunghyun Khim

    (CeNSCMR, Seoul National University)

  • Sae Hwan Chun

    (CeNSCMR, Seoul National University)

  • Y. Jo

    (National High Magnetic Field Laboratory (NHMFL), Florida State University
    Present address: Department of Physics, Kyungpook National University, Daegu 702-701, Korea.)

  • L. Balicas

    (National High Magnetic Field Laboratory (NHMFL), Florida State University)

  • H. T. Yi

    (Rutgers University)

  • S.-W. Cheong

    (Rutgers University)

  • N. Harrison

    (NHMFL, Los Alamos National Laboratory (LANL))

  • C. D. Batista

    (LANL)

  • Jung Hoon Han

    (Sungkyunkwan University)

  • Kee Hoon Kim

    (CeNSCMR, Seoul National University
    Institute of Applied Physics, Seoul National University)

Abstract

Insulating magnets can display novel signatures of quantum fluctuations as similar to the case of metallic magnets. However, their weak spin-lattice coupling has made such observations challenging. Here we find that antiferromagnetic (AF) quantum fluctuations manifest in the dielectric properties of multiferroic Ba2CoGe2O7, where a ferroelectric polarization develops concomitant to an AF ordering. Upon application of a magnetic field (H), dielectric constant shows a characteristic power-law dependence near absolute zero temperature and close to the critical field Hc=37.1 T due to enhanced AF quantum fluctuations. When H>Hc, the dielectric constant shows the temperature-dependent anomalies that reflect a crossover from a field-tuned quantum critical to a gapped spin-polarized state. We uncover theoretically that a linear relation between AF susceptibility and dielectric constant stems from the generic magnetoelectric coupling and directly explains the experimental findings, opening a new pathway for studying quantum criticality in condensed matter.

Suggested Citation

  • Jae Wook Kim & Seunghyun Khim & Sae Hwan Chun & Y. Jo & L. Balicas & H. T. Yi & S.-W. Cheong & N. Harrison & C. D. Batista & Jung Hoon Han & Kee Hoon Kim, 2014. "Manifestation of magnetic quantum fluctuations in the dielectric properties of a multiferroic," Nature Communications, Nature, vol. 5(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5419
    DOI: 10.1038/ncomms5419
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    Cited by:

    1. 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.

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