Magneto-transport and Magnetism in Antiferromagnetic GdSbTe

ORAL

Abstract

The crystal structure of GdSbTe belongs to the PbFCl-type family that is known for exhibiting a possible topological nodal-line phase. The spin-7/2 Gd3+ ions form a square lattice in the ab plane with large moments. Recently, a Dirac-like state was observed in GdSbTe by ARPES measurement [1]. Magnetization and specific heat measurements also revealed an antiferromagnetic (AFM) transition with a Néel temperature of around 12 K [2], making it a suitable system to study the interplay between AFM and topological states. Here, we report the angular dependence of the magneto-transport properties in GdSbTe. Several features in magnetoresistance (MR) measurements were uncovered while sweeping an in-plane magnetic field, including abrupt increases of MR occurs at 2 T and 6 T and an unusual hysteretic giant magnetoresistance (GMR)-like behavior at higher magnetic fields. We remark that those features are absent when the magnetic field is applied perpendicular to the ab-plane direction. The magneto-transport and magnetization measurements up to a magnetic field of 14 T will be presented and compared to several metallic spin systems.

[1] M. M. Hosen et al., Sci. Rep. 8, 13283 (2018).
[2] R. Sankar et al., in preparation.

–

Presenters

  • Tsung-Chi Wu

    • Institute of Physics, Academia Sinica
    • Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
    • Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan

Authors

  • Tsung-Chi Wu

    • Institute of Physics, Academia Sinica
    • Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
    • Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan

  • Akhilesh Singh

    • Institute of Physics, Academia Sinica
    • Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
    • Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan

  • Ming-Chin Chen

    • Institute of Physics, Academia Sinica
    • Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan

  • Raman Sankar

    • Center for Condensed Matter Sciences, National Taiwan University
    • Center for Condensed Matter Science, National Taiwan University
    • Center of Condensed Matter Sciences, National Taiwan University
    • Institute of Physics, Academia Sinica
    • National Taiwan University
    • Physics, Academia Sinica, Taiwan

  • Fangcheng Chou

    • Center for Condensed Matter Sciences, National Taiwan University
    • Center of Condensed Matter Sciences, National Taiwan University
    • National Taiwan University

  • Wei-Li Lee

    • Institute of Physics, Academia Sinica
    • Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
    • Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan