Magnetic structure of the antiferromagnetic Weyl semimetal candidates Mn3(Ge/Sn)

ORAL

Abstract

The recent discovery of Anomalous Hall Effect in Mn3X (X=Sn,Ge) suggests the existence of Weyl nodes in the electronic band structure of these non-colinear antiferromagnets. The magnetic structure of Mn3X is crucial to Weyl physics, but is still under debate due to the lack of experimental studies. To determine the structure, we report polarized neutron diffraction studies on Mn3X (X=Sn,Ge). In Mn3Ge, a k=0 antichiral structure was determined, which naturally explains the origin of a net in-plane magnetization along the [110] direction. In Mn3Sn, an additionnal incommensurate phase was discovered and further characterized with polarization analysis. The magnetic ground state selection of Mn3X (X=Sn,Ge) will be discussed in terms of exchange, Dzyaloshinskii-Moriya and crystal electric field interactions.

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Presenters

  • Youzhe Chen

    IQM, Johns Hopkins University, Johns Hopkins University

Authors

  • Youzhe Chen

    IQM, Johns Hopkins University, Johns Hopkins University

  • Jonathan Gaudet

    Department of Physics and Astronomy, McMaster University, Johns Hopkins University, Baltimore, MD 21218, Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Physics and Astronomy, Johns Hopkins University, IQM, Johns Hopkins University

  • Guy G Marcus

    IQM, Johns Hopkins University, Johns Hopkins University

  • Naoki kiyohara

    ISSP, U Tokyo, U Tokyo, ISSP

  • Agustinus A. Nugroho

    ISSP, U Tokyo, U Tokyo, ISSP

  • Yang Zhao

    NIST Center for Neutron Research, National Institute of Standards and Technology, NCNR, NIST

  • Satoru Nakatsuji

    University of Tokyo, Institute for Solid State Physics, Advanced Materials Science, The University of Tokyo, University of Tokyo, ISSP, U Tokyo, U Tokyo, ISSP, ISSP, University of Tokyo

  • Collin Broholm

    Johns Hopkins, Johns Hopkins University, IQM, Johns Hopkins University, Department of Physics and Astronomy, Johns Hopkins University