Quantum Oscillations in Trigonal PtBi1.6 Single Crystals

ORAL

Abstract

Transition-metal dichalcogenide PtBi2 is known to form multiple structures with extreme large magnetoresistance (XMR). We have successfully grown high-quality PtBi1.6 single crystals with the trigonal structure. In addition to the XMR effect, the magnetization exhibits de Haas–van Alphen (dHvA) oscillations at low temperatures. Through Fourier transformation, we identify two oscillation frequencies Fδ = 4 T and Fα = 39 T with the sign of Zeeman splitting. Using Lifshitz–Kosevich (LK) formula to fit experimental data, we obtain the effective masses (m*δ = 0.092m0 and m*α = 0.189m0) and Berry phases (ΦBδ = (0.82 + 2δ)π and ΦBα = (0.86 + 2δ)π) for both δ and α bands. The results indicate the trigonal PtBi1.6 has non-trivial topological properties.

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Presenters

  • Lingyi Xing

    Louisiana State University

Authors

  • Lingyi Xing

    Louisiana State University

  • Ramakanta Chapai

    Louisiana State University, Physics and Astronomy, Louisiana State University

  • Roshan Nepal

    Louisiana State University, Physics and Astronomy, Louisiana State University

  • Rongying Jin

    Louisiana State University, Physics, Louisiana State University, Physics and astronomy, Louisiana State University, 2Condensed Matter Physics and Materials Science Departement, Brookhaven National Laboratory, Department of Physics and Astronomy, Louisiana State University, Physics and Astronomy, Louisiana State University