Large Magnetoresistance and Fermi Surface Studies of Sb2Te<sub>2-x</sub>Se<sub>x</sub> Single Crystals

ORAL

Abstract


We have investigated the magneto-transport properties of topological single crystals, Sb2Te2-xSex. The electrical resistance decreases with temperature showing a metallic behavior. Under high magnetic fields, magnetoresistance (MR) increases almost linearly with the applied field, and it reaches a value as high as 300 % at 14 T with no sign of saturation. In addition, the MR shows clear Shubnikov de Haas (SdH) oscillations with a single frequency. To explore the Fermi surface topology, we have carried out detailed angle dependence measurements of SdH oscillations and determined the Berry phase characteristics. We have also analyzed the temperature-dependent quantum oscillations using the Lifshitz-Kosevich theory and calculated several physical parameters characterizing the SdH oscillations.

*This work at West Texas A&M University is supported by the start-up grant from the Paul Engler College of Agriculture and Natural Sciences and the Welch Foundation (Grant No. AE-025).

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Presenters

  • Thinh Nguyen

    • Chemistry and Physics, West Texas A&M Univ

Authors

  • Thinh Nguyen

    • Chemistry and Physics, West Texas A&M Univ

  • Narayan Poudel

    • Nuclear Materials Department, Idaho National Laboratory
    • Idaho National Laboratory
    • Idaho National Laboratory, Idaho Falls, Idaho 83415, USA
    • Texas Center for Superconductivity and Department of Physics, University of Houston

  • Duncan Miertschin

    • Chemistry and Physics, West Texas A&M Univ

  • Mitch Chou

    • Sun Yat-Sen University

  • Hung-Duen Yang

    • Sun Yat-Sen University
    • Natl Sun Yat Sen Univ
    • Department of Physics and Center of Crystal Research, National Sun Yat-Sen University

  • Krzysztof Gofryk

    • Idaho National Laboratory
    • Idaho National Lab

  • Keshav Shrestha

    • West Texas State Univ
    • Chemistry and Physics, West Texas A&M Univ
    • Chemistry and Physics, West Texas A&M University
    • Florida State University