Gap structure of the nonsymmorphic superconductor LaNiGa<sub>2</sub> probed by μSR

ORAL

Abstract

We report muon spin rotation (μSR) measurements of the temperature dependence of the absolute value of the magnetic penetration depth and the magnetic field dependence of the vortex core size in the mixed state of the centrosymmetric superconductor LaNiGa2. The temperature dependence of the normalized superfluid density is shown to be well described by a two-band model with strong interband coupling. Consistent with a strong coupling of the superconducting condensates in two different bands, we show that the field dependence of the vortex core size resembles that of a single-band superconductor. Our results lend support to the proposal that LaNiGa2 is a fully-gapped, internally antisymmetric nonunitary spin-triplet superconductor.

*We acknowledge support from the Natural Sciences and Engineering Research Council of Canada, the Engineering and Physical Sciences Research Council, the University of California Laboratory Fees Research Program and the National Science Foundation.

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Presenters

  • Jeff E Sonier

    • Simon Fraser University

Authors

  • Jeff E Sonier

    • Simon Fraser University

  • Shyam Sundar

    • University of St. Andrews

  • Nasrin Azari

    • Simon Fraser University

  • Mae Abedi

    • Simon Fraser University

  • Michael Yakovlev

    • Simon Fraser University

  • David E Broun

    • Simon Fraser University

  • Ulas Ozdemir

    • Simon Fraser University

  • Sarah R Dunsiger

    • TRIUMF

  • Davis Zackaria

    • UC Davis

  • Valentin Taufour

    • UC Davis
    • University of California, Davis