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Critical phenomena of emergent magnetic monopoles in a chiral magnet

Author

Listed:
  • N. Kanazawa

    (The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan)

  • Y. Nii

    (RIKEN Center for Emergent Matter Science (CEMS)
    Present address: Department of Basic Science, The University of Tokyo, Tokyo 153-8902, Japan)

  • X. -X. Zhang

    (The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan)

  • A. S. Mishchenko

    (RIKEN Center for Emergent Matter Science (CEMS))

  • G. De Filippis

    (Università di Napoli Federico II)

  • F. Kagawa

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Y. Iwasa

    (The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan
    RIKEN Center for Emergent Matter Science (CEMS))

  • N. Nagaosa

    (The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan
    RIKEN Center for Emergent Matter Science (CEMS))

  • Y. Tokura

    (The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan
    RIKEN Center for Emergent Matter Science (CEMS))

Abstract

Second-order continuous phase transitions are characterized by symmetry breaking with order parameters. Topological orders of electrons, characterized by the topological index defined in momentum space, provide a distinct perspective for phase transitions, which are categorized as quantum phase transitions not being accompanied by symmetry breaking. However, there are still limited observations of counterparts in real space. Here we show a real-space topological phase transition in a chiral magnet MnGe, hosting a periodic array of hedgehog and antihedgehog topological spin singularities. This transition is driven by the pair annihilation of the hedgehogs and antihedgehogs acting as monopoles and antimonopoles of the emergent electromagnetic field. Observed anomalies in the magnetoresistivity and phonon softening are consistent with the theoretical prediction of critical phenomena associated with enhanced fluctuations of emergent field near the transition. This finding reveals a vital role of topology of the spins in strongly correlated systems.

Suggested Citation

  • N. Kanazawa & Y. Nii & X. -X. Zhang & A. S. Mishchenko & G. De Filippis & F. Kagawa & Y. Iwasa & N. Nagaosa & Y. Tokura, 2016. "Critical phenomena of emergent magnetic monopoles in a chiral magnet," Nature Communications, Nature, vol. 7(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11622
    DOI: 10.1038/ncomms11622
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    Cited by:

    1. Y. Hayashi & Y. Okamura & N. Kanazawa & T. Yu & T. Koretsune & R. Arita & A. Tsukazaki & M. Ichikawa & M. Kawasaki & Y. Tokura & Y. Takahashi, 2021. "Magneto-optical spectroscopy on Weyl nodes for anomalous and topological Hall effects in chiral MnGe," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    2. Erjian Cheng & Limin Yan & Xianbiao Shi & Rui Lou & Alexander Fedorov & Mahdi Behnami & Jian Yuan & Pengtao Yang & Bosen Wang & Jin-Guang Cheng & Yuanji Xu & Yang Xu & Wei Xia & Nikolai Pavlovskii & D, 2024. "Tunable positions of Weyl nodes via magnetism and pressure in the ferromagnetic Weyl semimetal CeAlSi," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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