Systems with strong spin-orbit coupling have been a topic of fundamental interest in condensed matter physics due to the exotic topological phases and the unconventional phenomenon they exhibit. In this particular study, we have investigated the superconductivity in the transition-metal ternary noncentrosymmetric compounds $\mathrm{La}M\mathrm{Si}$ ($M=\mathrm{Ni}$, Pt) with different spin-orbit coupling strength, using muon-spin rotation and relaxation measurements. Transverse-field measurements made in the vortex state indicate that the superconductivity in both materials is fully gapped, with a conventional $s$-wave pairing symmetry and BCS-like magnitudes for the zero-temperature gap energies. Zero-field measurements suggest a time-reversal symmetry preserved superconductivity in both the systems, though a small increase in muon depolarization is observed upon decreasing temperature. However, this has been attributed to quasistatic electronic fluctuations.

中文翻译：

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使用μ自旋旋转和弛豫探测LaMSi（M = Ni，Pt）中的无节点超导

由于奇异的拓扑相和它们表现出的非常规现象，具有强自旋轨道耦合的系统一直是凝聚态物理研究的基本课题。在这项特殊的研究中，我们研究了过渡金属三元非中心对称化合物中的超导性$啦\mathrm{中号}硅$ （$\mathrm{中号}=你$，Pt）具有不同的自旋轨道耦合强度，使用μ子自旋旋转和弛豫测量。在涡流状态下进行的横向场测量表明，两种材料的超导性都是常规的$s$零缝隙能量的波配对对称性和类似BCS的幅度。零场测量表明在两个系统中都保留了时间反转对称性的超导性，尽管在降低温度时会观察到μ子去极化的少量增加。但是，这归因于准静态电子波动。