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X-ray study of ferroic octupole order producing anomalous Hall effect

Journal Article · · Nature Communications
 [1];  [2];  [3];  [4];  [5];  [2];  [2];  [6];  [6];  [7];  [3];  [8];  [3];  [7];  [9];  [10]
  1. Tohoku Univ., Sendai (Japan); Tohoku Univ., Sendai (Japan)
  2. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo (Japan)
  3. Tohoku Univ., Sendai (Japan)
  4. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo (Japan); National Institute for Materials Science (NIMS), Tsukuba (Japan); RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Institute of Materials Structure Science, Tsukuba (Japan)
  5. Kyoto Univ. (Japan)
  6. Univ. of Tokyo (Japan)
  7. Institute of Materials Structure Science, Tsukuba (Japan)
  8. Univ. of Tokyo (Japan); Johns Hopkins Univ., Baltimore, MD (United States)
  9. RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Univ. of Tokyo (Japan)
  10. Tohoku Univ., Sendai (Japan); Japan Synchrotron Radiation Research Institute, Sayo, Hyogo (Japan)

Recently found anomalous Hall, Nernst, magnetooptical Kerr, and spin Hall effects in the antiferromagnets Mn3X (X = Sn, Ge) are attracting much attention for spintronics and energy harvesting. Since these materials are antiferromagnets, the origin of these functionalities is expected to be different from that of conventional ferromagnets. Here, we report the observation of ferroic order of magnetic octupole in Mn3Sn by X-ray magnetic circular dichroism, which is only predicted theoretically so far. The observed signals are clearly decoupled with the behaviors of uniform magnetization, indicating that the present X-ray magnetic circular dichroism is not arising from the conventional magnetization. We have found that the appearance of this anomalous signal coincides with the time reversal symmetry broken cluster magnetic octupole order. Our study demonstrates that the exotic material functionalities are closely related to the multipole order, which can produce unconventional cross correlation functionalities.

Research Organization:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); JSPS KAKENHI; Research Foundation for Opto-Science and Technology; MEXT Quantum Leap Flagship Program; Scientific Research on Innovative Areas; Ministry of Education, Culture, Sports, Science, and Technology of Japan; Center for Science and Innovation in Spintronics (CSIS) Tohoku University
Grant/Contract Number:
SC0019331
OSTI ID:
1853082
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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