Nodeless superconductivity in noncentrosymmetric LaRhSn
Abstract
The superconducting order parameter of the noncentrosymmetric superconductor LaRhSn is investigated by means of low temperature measurements of the specific heat, muon-spin relaxation/rotation (μSR) and the tunnel-diode oscillator (TDO) based method. The specific heat and magnetic penetration depth [λ(T)] show an exponentially activated temperature dependence, demonstrating fully gapped superconductivity in LaRhSn. The temperature dependence of λ-2(T) deduced from the TDO based method and μSR show nearly identical behavior, which can be well described by a single-gap s-wave model, with a zero temperature gap value of (0)=1.77(4)kBTc. The zero-field μSR spectra do not show detectable changes upon cooling below Tc, and therefore there is no evidence for time-reversal-symmetry breaking in the superconducting state.
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