μSR study of noncentrosymmetric superconductor PbTaSe2
Abstract
We present muon spin rotation (μSR) measurements on the noncentrosymmetric superconductor PbTaSe2. From measurements in an applied transverse field between Hc1 and Hc2, we extract the superfluid density as a function of temperature in the vortex state. This data can be fit with a fully gapped two-band model, consistent with previous evidence from ARPES, thermal conductivity, and resistivity. Furthermore, zero field measurements show no evidence for a time reversal symmetry breaking field greater than 0.05~G in the superconducting state. This makes exotic fully gapped spin-triplet states unlikely, and hence we contend that PbTaSe2 is characterized by conventional BCS s-wave superconductivity in multiple bands.
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