Study of High-Pressure Effects on Weyl Semimetal Mo0.25W0.75Te2

ORAL

Abstract

Transition metal dichalcogenides MoxW1-xTe2 have attracted great research interest since they exhibit the Weyl fermion semimetal state with x = 0.25, offering the possibility to realize a tunable Weyl semimetal [1]. Weyl semimetals show different interesting properties, including negative longitudinal magnetoresistance, quantum anomalous Hall effect, and unconventional superconductivity. Single crystals of Mo0.25W0.75Te2 with length up to 1.1 cm were grown via chemical vapor transport method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, and transport measurements. High pressure effects have been investigated by using a homemade BeCu clamp cell. A possible structural transition was observed under pressure at and above 1.2 GPa, but the signature of superconductivity in Mo0.25W0.75Te2 at temperature down to 1.3 K and under pressure up to 1.7 GPa was not detected. High pressure studies above 1.7 GPa using a diamond anvil cell are in progress.

[1] Belopolski, I. et al., Nat. Commun. 7, 13643 (2016).

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

  • Narayan Poudel

    Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA, Idaho National Laboratory, Idaho Falls, ID 83402, USA

  • Melissa Gooch

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

  • Zheng Wu

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

  • Ching-Wu Chu

    Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA