Single-crystal neutron diffraction study of Dirac material EuMnSb<sub>2</sub>

ORAL

Abstract

EuMnSb2 is a potential Dirac semimetal with Dirac fermions located in the Sb layers. These Dirac fermions have the potential to be controlled by a magnetic field if the magnetic order of the Eu or Mn sublattices couples to them. A large anisotropic magnetoresistance suggests that this coupling is strong in EuMnSb2. Here we present results from single-crystal neutron diffraction experiments on EuMnSb2. We find that the Eu and Mn magnetic sublattices order antiferromagnetically (AF) at 24(1) K and 324(1) K, respectively, with an additional magnetic phase transition at 9(1) K related to the coupling between both magnetic sublattices. Neutron diffraction shows that each AF phase is characterized by a magnetic unit cell equal to the chemical unit cell in contrast to Mossbauer measurements which suggest incommensurability. Our analysis indicates that the ordered Eu moments chiefly point perpendicular to the Sb planes and that the Mn moments align within the planes.

*This work was supported by the CATS, an EFRC, and the DMSE, both funded by the U.S. DOE, Office of BES through the Ames Laboratory under its Contract No. DE-AC02-07CH11358.

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Presenters

  • John Wilde

    • Physics and Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames

Authors

  • John Wilde

    • Physics and Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames

  • Benjamin Ueland

    • Ames Laboratory, Ames, IA 50011, USA
    • Division of Materials Science & Engineering, Ames Laboratory
    • Ames Laboratory
    • Ames Lab

  • Simon Xavier Riberolles

    • Ames Laboratory

  • Dominic H Ryan

    • Department of Physics and Centre for the Physics of Materials, McGill University
    • McGill University

  • Andreas Kreyssig

    • Ames Laboratory, Ames, IA 50011, USA; Iowa State University, Ames IA 50011, USA
    • Physics and Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory, Ames, IA 50011, USA; Iowa State University, Ames, IA 50011, USA

  • David Vaknin

    • Ames Laboratory, Iowa State University
    • Ames Laboratory
    • Ames laboratory, Iowa State University

  • Thomas Heitmann

    • University of Missouri Research Reactor
    • MU Research Reactor, Univ of Missouri - Columbia, MO 65211 USA
    • Missouri Research Reactor, University of Missouri
    • University of Missouri
    • MURR
    • The Missouri Research Reactor, University of Missouri - Columbia
    • The Missouri Research Reactor, University of Missouri Columbia
    • Research Reactor-MURR; Physics & Astronomy, Univ of Missouri, Columbia
    • Univ of Missouri - Columbia

  • Yong Liu

    • Ames Laboratory

  • Sergey L. Bud'ko

    • Iowa State University
    • Ames Laboratory and Iowa State University
    • Ames Lab
    • Ames laboratory, Ames, IA
    • Department of Physics & Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Iowa State University and Ames Laboratory
    • Iowa State University, Ames Laboratory
    • Division of Materials Sciences & Engineering, Ames Lab and Iowa State University
    • Iowa State University/Ames Laboratory

  • Robert McQueeney

    • Ames Laboratory, Ames, IA 50011, USA; Iowa State University, Ames IA 50011, USA
    • Iowa State University
    • Ames Laboratory, Iowa State University
    • Physics and Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory, Ames, IA 50011, USA; Iowa State University, Ames, IA 50011, USA