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

Motoi Kimata (), Norimasa Sasabe, Kensuke Kurita, Yuichi Yamasaki, Chihiro Tabata, Yuichi Yokoyama, Yoshinori Kotani, Muhammad Ikhlas, Takahiro Tomita, Kenta Amemiya, Hiroyuki Nojiri, Satoru Nakatsuji, Takashi Koretsune, Hironori Nakao, Taka-hisa Arima and Tetsuya Nakamura
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Motoi Kimata: Tohoku University
Norimasa Sasabe: Japan Synchrotron Radiation Research Institute (JASRI)
Kensuke Kurita: Tohoku University
Yuichi Yamasaki: National Institute for Materials Science (NIMS)
Chihiro Tabata: Kyoto University
Yuichi Yokoyama: Japan Synchrotron Radiation Research Institute (JASRI)
Yoshinori Kotani: Japan Synchrotron Radiation Research Institute (JASRI)
Muhammad Ikhlas: University of Tokyo
Takahiro Tomita: University of Tokyo
Kenta Amemiya: High Energy Accelerator Research Organization
Hiroyuki Nojiri: Tohoku University
Satoru Nakatsuji: University of Tokyo
Takashi Koretsune: Tohoku University
Hironori Nakao: High Energy Accelerator Research Organization
Taka-hisa Arima: Center for Emergent Matter Science (CEMS), RIKEN
Tetsuya Nakamura: Tohoku University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract 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.

Date: 2021
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DOI: 10.1038/s41467-021-25834-7

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