Long Range Intrinsic Magnetic Order in Bulk Semiconducting MoTe<sub>2</sub> and MoSe<sub>2</sub>

ORAL

Abstract

The search for semiconducting materials with intrinsic dilute magnetism has been an ongoing challenge for many years. The semiconducting transition metal dichalcogenides have drawn great interest due to a wide array of electrical and optical applications. In this work, we report the direct observation of long-range magnetic order below TM=40K and TM=100K in bulk 2H-MoTe2 and 2H-MoSe2 respectively by muon spin relaxation/rotation (µSR). To investigate the origin of the long-range magnetic order, we perform scanning tunneling microscopy (STM) which reveals a uniform density of intrinsic defects in the materials. Atomic-resolution STM reveals that the primary defects are substitutions of chalcogen atoms, likely by molybdenum. Hubbard density functional theory (DFT) simulations predict that these molybdenum substitutional defects induce magnetic moments at defect sites with long range interaction. Scanning tunneling spectroscopy taken at defect sites is also in confirmation with the L-DOS calculated via the DFT simulations . Thus, we conclude that the long range magnetic order observed via µSR is native to the materials, due to interacting intrinsic magnetic defects.

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Presenters

  • Alexander Kerelsky

    • Columbia Univ
    • Physics, Columbia Univ

Authors

  • Alexander Kerelsky

    • Columbia Univ
    • Physics, Columbia Univ

  • Zurab Guguchia

    • Columbia Univ
    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
    • Department of Physics, Columbia university

  • Drew Edelberg

    • Columbia Univ
    • Physics, Columbia Univ

  • Soham Banerjee

    • Applied Physics , University of Columbia
    • Columbia Univ
    • Brookhaven Natl Lab
    • Department of Applied Physics and Applied Mathematics, Columbia university

  • Fabian Rohr

    • Department of Chemistry, Princeton University
    • Princeton

  • Declan Scullion

    • Queen's University

  • Mathias Augustin

    • Queen's University

  • Daniel Rhodes

    • Columbia Univ
    • Physics, Columbia Univ
    • Columbia University
    • Mechanical Engineering, Columbia University

  • Zurab Shermadini

    • Paul Scherrer Institute
    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute

  • Hubertus Luetkens

    • Paul Scherrer Institute
    • Paul Sherrer Institut
    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute

  • Alexander Shengelaya

    • Tbislisi State University
    • Department of Physics, Tbilisi State University

  • Christopher Baines

    • Paul Scherrer Institute

  • Elvezio Morenzoni

    • Paul Scherrer Institute
    • Paul Sherrer Institut
    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute

  • Alex Amato

    • Paul Scherrer Institute
    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute

  • Rustem Khasanov

    • Paul Scherrer Institute
    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
    • Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute

  • James Hone

    • Columbia University
    • Columbia Univ
    • Mechanical Engineering, Columbia Univ.
    • Mechanical Engineering, Columbia University
    • Physics, Columbia Univ
    • Department of Mechanical Engineering, Columbia University

  • Simon J Billinge

    • Columbia Univ

  • Elton Santos

    • Queen's University
    • Physics, Queen's University Belfast

  • Yasutomo Uemura

    • Columbia Univ
    • Department of Physics, Columbia University
    • Columbia University
    • Department of Physics, Columbia university

  • Abhay Pasupathy

    • Columbia University
    • Columbia Univ
    • Physics, Columbia Univ
    • Department of Physics, Columbia university