Superconductivity with nontrivial band topology provides a platform for exploring topological superconductivity and its quantum applications. A detailed microscopic understanding of the superconducting ground state in such materials is crucial. Here, we report the results of a muon spin rotation/relaxation study $\left(\mu \mathrm{SR}\right)$ of the topologically nontrivial superconductor SnAs, which exhibits superconductivity below 3.74(1) $\mathrm{K}$. Zero-field $\mu \mathrm{SR}$ data reveal that this system is a time-reversal invariant superconductor, and systematic transverse-field $\mu \mathrm{SR}$ measurements unveil the type-I nature of the SnAs superconductor. We have established the superconducting phase diagram to understand the intermediate state of type-I superconductors. Moreover, ab initio band structure and phonon calculations are performed, which correlate with the experimental characterization.

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• Superconductivity
• Topological materials
• Type-I superconductors
• Density functional calculations
• Muon spin relaxation & rotation