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Kanazawa N, Nii Y, Zhang XX, et al. Critical phenomena of emergent magnetic monopoles in a chiral magnet. Nat Commun. 2016;7:11622doi: 10.1038/ncomms11622.
Kanazawa, N., Nii, Y., Zhang, X. X., Mishchenko, A. S., De Filippis, G., Kagawa, F., Iwasa, Y., Nagaosa, N., & Tokura, Y. (2016). Critical phenomena of emergent magnetic monopoles in a chiral magnet. Nature communications, 711622. https://doi.org/10.1038/ncomms11622
Kanazawa, N, et al. "Critical phenomena of emergent magnetic monopoles in a chiral magnet." Nature communications vol. 7 (2016): 11622. doi: https://doi.org/10.1038/ncomms11622
Kanazawa N, Nii Y, Zhang XX, Mishchenko AS, De Filippis G, Kagawa F, Iwasa Y, Nagaosa N, Tokura Y. Critical phenomena of emergent magnetic monopoles in a chiral magnet. Nat Commun. 2016 May 16;7:11622. doi: 10.1038/ncomms11622. PMID: 27181484; PMCID: PMC4873648.
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Nat Commun. 2016 May 16;7:11622. doi: 10.1038/ncomms11622.

Critical phenomena of emergent magnetic monopoles in a chiral magnet.

Nature communications

N Kanazawa, Y Nii, X-X Zhang, A S Mishchenko, G De Filippis, F Kagawa, Y Iwasa, N Nagaosa, Y Tokura

Affiliations

  1. Department of Applied Physics, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan.
  2. RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
  3. SPIN-CNR and Dipartimento di Fisica, Università di Napoli Federico II, I-80126 Napoli, Italy.

PMID: 27181484 PMCID: PMC4873648 DOI: 10.1038/ncomms11622

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.

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