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Nodeless superconductivity in noncentrosymmetric LaRhSn

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arxiv 2301.01467 v1 pith:4LN6LYHG submitted 2023-01-04 cond-mat.supr-con

Z. Y. Nie , J. W. Shu , A. Wang , H. Su , W. Y. Duan , A. D. Hillier , D. T. Adroja , P. K. Biswas
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T. Takabatake M. Smidman H. Q. Yuan
This is my paper · ORCID
classification cond-mat.supr-con
keywords temperaturelarhsndependenceheatlambdamethodnoncentrosymmetricspecific
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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 ($\mu$SR) and the tunnel-diode oscillator (TDO) based method. The specific heat and magnetic penetration depth [$\lambda(T)$] show an exponentially activated temperature dependence, demonstrating fully gapped superconductivity in LaRhSn. The temperature dependence of $\lambda^{-2}(T)$ deduced from the TDO based method and $\mu$SR show nearly identical behavior, which can be well described by a single-gap $s$-wave model, with a zero temperature gap value of $\Delta(0)=1.77(4)k_BT_c$. The zero-field $\mu$SR spectra do not show detectable changes upon cooling below $T_c$, and therefore there is no evidence for time-reversal-symmetry breaking in the superconducting state.

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