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NMR and NQR measurements in LaNiGa<sub>2</sub>

ORAL

Abstract

LaNiGa2 is a layered centrosymmetric superconductor with an orthorhombic crystal structure. ??SR experiments have observed spontaneous magnetic fields at the onset of superconducting state, implying time-reversal symmetry breaking and suggesting the possibility of triplet pairing. We report on NQR measurements performed on 139La down to dilution fridge temperatures showing a large shift to the spectrum in the superconducting state. We also report on continued normal state NMR measurements on 69Ga determining the anisotropy of the electric field gradient at the two 69Ga sites. These measurements are shown to be consistent with band structure calculations.

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Presenters

  • Phurba Sherpa

    University of California, Davis

Authors

  • Phurba Sherpa

    University of California, Davis

  • Igor Vinograd

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

  • Michihiro Hirata

    Los Alamos National Laboratory

  • Riku Yamamoto

    Los Alamos National Laboratory

  • Jackson R Badger

    University of California, Davis

  • Antia S Botana

    Argonne National Laboratory, Arizona State University

  • Myung-Chul Jung

    Arizona State University

  • Valentin Taufour

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

  • Nicholas J Curro

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