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Determination of the magnetic order in the EuIn<sub>2</sub>As<sub>2</sub>, an axion insulator candidate

ORAL

Abstract

EuIn2As2 is a Zintl compound recently reported as a possible first example of axion insulator with antiferromagnetic (AF) long-range order and characteristic colossal negative magnetoresistance. It thus represents a unique platform to investigate the physics of axion insulators and, in particular, to focus on the interplay between the AF order and the topologically protected features of the electronic band structure. Here, we present results from single-crystal magnetic diffraction experiments. Surprisingly, our results reveal the successive stabilization of two different sets of magnetic Bragg reflections indexed with the propagation vectors k1=(0,0,0.31) and k2=(0,0,0) below TN1=17 and TN2=15 K, respectively, despite the chemical unit cell containing only a single Eu site. The two magnetic structures are believed to coexist at T≤TN2, and were individually determined from refinement analyses. We will describe both magnetic structures and discuss the influence of our results upon the current understanding of the material’s topological features.

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Presenters

  • Simon Riberolles

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

Authors

  • Simon Riberolles

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

  • Brinda Kuthanazhi

    Ames Laboratory, Iowa State University, Iowa State University, Department of Physics & Astronomy, Iowa State University/Ames Laboratory, Department of Physics and Astronomy, Ames Laboratory/Iowa State Univeristy, Iowa State University/Ames Laboratory

  • Na Hyun Jo

    Iowa State University, Ames Laboratory, Iowa State University, Department of Physics & Astronomy, Iowa State University/Ames Laboratory, Department of Physics and Astronomy, Iowa State University/Ames Laboratory, Iowa State University/Ames Laboratory

  • Adam Kaminski

    Physics and Astronomy, Iowa State University, Ames Laboratory, Iowa State University, Department of Physics and Astronomy, Iowa State University/Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Department of Physics and Astronomy, Ames Laboratory/Iowa State Univeristy, Iowa State University/Ames Laboratory

  • Paul C Canfield

    Iowa State University, Ames Laboratory and Iowa State University, Ames Lab, Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA, Ames laboratory, Ames, IA, Ames Laboratory, Iowa State University, Department of Physics & Astronomy, Iowa State University/Ames Laboratory, Department of Physics and Astronomy, Iowa State University/Ames Laboratory, Iowa State University and Ames Laboratory, Iowa State University, Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Division of Materials Sciences & Engineering, Ames Lab and Iowa State University, Department of Physics and Astronomy, Ames Laboratory/Iowa State Univeristy, Iowa State University/Ames Laboratory

  • 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

  • Dominic H Ryan

    Physics, McGill University

  • Benjamin Ueland

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

  • 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