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MA: Fachverband Magnetismus
MA 27: Frustrated Magnets I
MA 27.13: Talk
Wednesday, March 20, 2024, 18:15–18:30, H 2013
Higher-order exchange driven noncoplanar magnetic state and large anomalous Hall effects in kagome magnet — •Charanpreet Singh1,2, Sk Jamaluddin2, Ashis K. Nandy2, Masashi Tokunaga3, Maxim Avdeev4, and Ajaya K. Nayak2 — 1Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 2School of Physical Sciences, National Institute of Science Education and Research, Jatni-752050, India — 3The Institute for Solid-State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan — 4Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, New South Wales 2234, Australia
The noncollinear kagome antiferromagnet Mn3Sn breaks time reversal symmetry due to the cluster octupole order present in this system. We show that electron doping can induce a noncoplanar magnetic state in Mn3Sn, which is driven by higher-order exchange interactions and confirmed by our neutron diffraction measurements. The resultant noncoplanar state exhibits a highly tunable scalar spin chirality (SSC) and generates a unique anomalous Hall signal, distinct from the previously examined octupole order-induced Hall signal in this sample. This introduces a novel dual-order phenomenon, where both cluster octupole order and SSC independently contribute to distinct Hall signals. Importantly, the independent manipulation of these orders is demonstrated. Our results open up new possibilities to explore phenomena associated with multiple orders in frustrated magnets.
Keywords: Kagome antiferromagnets; magnetic order; anomalous Hall; High order exchange interaction; neutron diffraction