Structural and physical properties of topological semimetal candidate EuZn<sub>2</sub>As<sub>2</sub>

ORAL

Abstract

Recent theoretical calculations predict nontrivial topology in magnetic materials, such as EuCd2As2, with the type-IV magnetic space group symmetry. We have successfully grown EuZn2As2 single crystals with the trigonal structure (P-3m1) as determined by the X-ray diffraction measurements. The magnetic susceptibility, electrical resistivity, and specific heat indicate that EuZn2As2 orders antiferromagnetically (AFM) at TN = 19 K. Single crystal neutron diffraction refinement reveals the A-type AFM structure of Eu with the ordered moment of 7.33μB. At T < TN, the (0 0 ½) peak intensity increases and can be described by (TN – T/TN)2β with β ~ 0.23, implying two-dimensional magnetic ordering. These results indicate that EuZn2As2 exhibits the same crystallographic and magnetic structure as that of EuCd2As2.

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Presenters

  • Joanna Blawat

    • Louisiana State University

Authors

  • Joanna Blawat

    • Louisiana State University

  • Madalynn Marshall

    • Department of Chemistry and Chemical Biology, Rutgers University , Rutgers University, Piscataway, NJ08854, USA

  • Huibo Cao

    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Neutron Scattering, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory

  • Weiwei Xie

    • Louisiana State University, Department of Chemistry
    • Department of Chemistry and Chemical Biology, Rutgers University , Rutgers University, Piscataway, NJ08854, USA
    • Rutgers University, New Brunswick
    • Rutgers, The State University of New Jersey
    • Louisiana State University
    • Rutgers University

  • Rongying Jin

    • Louisiana State University, Department of Physics and Astronomy
    • Louisiana State University
    • Physics and Astronomy, Louisiana State University