Gap structure of the non-symmorphic superconductor LaNiGa2 probed by muSR
arxiv(2023)
摘要
We report muon spin rotation (muSR) 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
non-symmorphic 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.
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