Anomalous nuclear magnetic resonance spectra in powdered Bi$_2$Se$_3$

ORAL

Abstract

We present $^{209}$Bi NMR spectra and relaxation rate data on single crystal and powder samples of the topological insulator material Bi$_2$Se$_3$, including data on nanoscale powders with percentages of surface nuclei on the order of 2\%. Powder samples are measured as-prepared, annealed to relieve mechanical strains, and fixed in epoxy to prevent alignment of grains with the applied magnetic field of 9 T. Our results reveal anomalous behavior in both the angular dependence of the single crystal spectra and in the powder spectra. All powder spectra display features not accounted for by summation of spectra of single crystal orientations.

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Authors

  • D.M. Nisson

    Department of Physics, University of California, Davis

  • A.P. Dioguardi

    University of California Davis, Department of Physics, University of California, Davis

  • P. Klavins

    Department of Physics, University of California, Davis

  • X. Peng

    Department of Physics, University of California, Davis

  • Dong Yu

    Univ of California - Davis, Department of Physics, University of California, Davis

  • Nicholas Curro

    Department of Physics, University of California, Davis, Univ of California - Davis, University of California, Davis