Doping and pressure effects on Weyl semimetal Mo<sub>1-<i>x</i></sub>W<i><sub>x</sub></i>Te<sub>2</sub>

ORAL

Abstract

Systematic pressure and doping dependent study on Mo1-xWxTe2 was carried out to investigate the correlation among chemical doping, structural transition, and superconductivity. Doping dependent resistivity measurement at ambient pressure shows structural transition temperature (Ts) for MoTe2 to be 249 K, which continuously increases as doping level (x) increases and reaches a maximum value of 613 K for WTe2. The structural transition of WTe2 at ambient pressure is also confirmed by conducting temperature dependent synchrotron X-ray diffraction from 300 K to 673 K. Three samples with different doping (x = 0.10, 0.40, 0.75) were selected for high pressure measurement. The superconducting transition temperature - pressure (Tc - P) phase diagrams have been constructed and will be discussed. Our experimental results revealed a competition between the structural transition and superconductivity in Mo1-xWxTe2. Superconductivity emerges when the Ts is suppressed below 175 K and Tc increases as Ts is suppressed.

*The work performed at Houston is supported by USAFOSR Grant FA9550-15-1-0236, TLL Temple Foundation, JJ&R Moores Endowment, and State of Texas through TCSUH.

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Presenters

  • Rabin Dahal

    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA

Authors

  • Rabin Dahal

    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA

  • Liangzi Deng

    • Texas Center for Superconductivity, Univ of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • Texas Center for Superconductivity, University of Houston, Texas, 77204, USA
    • Texas Center for Superconductivity and Physics Department at the Univ of Houston

  • Narayan Poudel

    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Idaho National Laboratory

  • Melissa Gooch

    • Texas Center for Superconductivity, Univ of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • Texas Center for Superconductivity, University of Houston, Texas

  • Zheng Wu

    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Physics Department at the Univ of Houston

  • Hung-Cheng Wu

    • Physics, National Sun Yat-sen University
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Department of Physics, National Sun Yat-sen University
    • Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan
    • Natl Sun Yat Sen Univ
    • Texas Center for Superconductivity and Physics Department at the Univ of Houston

  • Hung-Duen Yang

    • Physics, National Sun Yat-sen University
    • Department of Physics, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
    • Department of Physics, National Sun Yat-sen University
    • Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan
    • Natl Sun Yat Sen Univ
    • Department of Physics, National Sun Yat-sen University, Taiwan

  • Chung-Kai Chang

    • National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
    • National Synchrotron Radiation Research Center, Taiwan
    • National Synchrotron Radiation Research Center
    • National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

  • Paul C. W. Chu

    • Texas Center for Superconductivity, Univ of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • Texas Center for Superconductivity and Physics Department at the Univ of Houston