Reorientation of antiferromagnetism in Co-doped FeSn and its implications for Dirac electron states

ORAL

Abstract

FeSn is an itinerant antiferromagnet with an Fe Kagome-lattice that hosts electronic Dirac states[1-2]. I will present magnetization measurements of single crystals of (Fe1-xCox)Sn revealing the evolution and suppression of this magnetic order with Co substitution. We interpret the dramatic changes of the magnetic anisotropy to indicate a reorientation of the magnetic moments from perpendicular to parallel to the hexagonal c-axis and confirm this with neutron diffraction. It has been proposed that the Dirac nodes observed in FeSn should become gapped if the moments rotate as our data suggests[1]. We identify Co-substituted compositions that adopts both antiferromagnetic configurations at different temperatures. This system provides a unique opportunity to study how the details of magnetic order impact Dirac electron states.

[1] Z. Lin, et al. (2019), Arxiv 1906.05755v1.
[2] M. Kang, et al. (2019), Arxiv 1906.02167v1.

*Research supported by the U. S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory.

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Presenters

  • William Meier

    • Oak Ridge National Lab
    • Ames Laboratory, Iowa State University, Ames; Oak Ridge National Laboratory, Oak Ridge
    • Ames Laboratory, Iowa State University

Authors

  • William Meier

    • Oak Ridge National Lab
    • Ames Laboratory, Iowa State University, Ames; Oak Ridge National Laboratory, Oak Ridge
    • Ames Laboratory, Iowa State University

  • Jiaqiang Yan

    • Materials Science and Engineering, The University of Tennessee
    • Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

  • Michael McGuire

    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Materials Science Division, Oak Ridge National Laboratory

  • Xiaoping Wang

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Andrew D Christianson

    • Materials Science & Technology Division, Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Materials Science and Technology Division, Oak Ridge National Lab
    • Materials Science and Technology Division, OakRidge National Laboratory

  • Brian Sales

    • Oak Ridge National Lab