Pressure-induced T<sub>c</sub> enhancement and insulator-metal transition in a nodal-line ferrimagnet Mn<sub>3</sub>Si<sub>2</sub>Te<sub>6</sub>

ORAL

Abstract

Ferrimagnetic semiconductor Mn3Si2Te6 is recently reported to show colossal angular magnetoresistance (CAMR), which is related to the insulator-to-metal transition driven by the tunable spin-orbit coupling gap with spin orientation [1]. Here we report our investigation on high pressure effect on Mn3Si2Te6 using electrical transport, magnetization, and synchrotron X-ray diffraction (XRD). Upon increasing pressure, the resistivity systematically decreases, leading to an insulator-to-metal transition (IMT) at Pc ~15 GPa, with  the CAMR is also being continuously weakened. On the other hand, the Curie temperature (Tc) is unusually enhanced from Tc = 78 K reaching up to nearly room temperature at Pc, above which it decreases in the metallic state. The Tc enhancement occurs in the same initial crystal structure while the IMT is accompanied by the possible structural transformation. The underlying mechanism of the metal-insulator transition and Tc enhancement in terms of the competition of intra- and interlayer couplings at high pressures will be discussed.

[1] J. Seo, et al. (in press)

*RAS acknowledges support by NRF Grant No. 2021R1I1A1A01060209. This work is supported by NSF (DMR-1933622) and DOE/NNSA (DE-NA0003975).

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Presenters

  • Resta A Susilo

    • Department of Physics, Pohang University of Science and Technology, Pohang, Korea

Authors

  • Resta A Susilo

    • Department of Physics, Pohang University of Science and Technology, Pohang, Korea

  • Yoonhan Lee

    • Department of Physics and Astronomy, CeNSCMR, Seoul National University, Seoul, Korea

  • Nilesh P Salke

    • University of Illinois Chicago
    • Department of Physics, University of Illinois Chicago, Chicago, USA

  • CHANDAN DE

    • Pohang University of Science and Technology
    • Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science & Laboratory of Pohang Emergent Materials, Pohang Accelerator Laboratory
    • CALDES, Institute for Basic Science (IBS), Pohang, Korea

  • Junho Seo

    • Institute for Basic Science; Pohang University of Science and Technology
    • Department of Physics, Pohang University of Science and Technology, Pohang, Korea

  • Russell J Hemley

    • University of Illinois Chicago
    • University of Illinois at Chicago
    • George Washington Univ
    • Departments of Physics and Chemistry, University of Illinois at Chicago
    • Department of Physics, University of Illinois at Chicago, Chicago, IL 60607, USA; Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607, USA
    • Department of Physics, University of Illinois Chicago, Chicago, USA
    • University of Illinois at Chicago, USA

  • Sang-Wook Cheong

    • Rutgers University, New Brunswick
    • Rutgers University

  • Duckyoung Kim

    • HPSTAR, Shanghai, China

  • Kyoo Kim

    • Korea Atomic Energy Research Institute
    • Korea Atomic Energy Research Institute (KAERI), Daejeon, Korea

  • Kee H Kim

    • Department of Physics and Astronomy, CeNSCMR, Seoul National University, Seoul, Korea

  • Jun Sung Kim

    • Pohang University of Science and Technology
    • Pohang Univ of Sci & Tech
    • Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
    • Department of Physics, Pohang University of Science and Technology, Pohang, Korea

  • Dean Smith

    • Argonne National Laboratory
    • HPCAT, X-ray Science Division, Argonne National Laboratory, Argonne, USA