Superconductivity with non-trivial band topology provides a novel 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 (μSR) of the topologically non-trivial superconductor SnAs, which exhibits superconductivity below 3.74(1) \si{K}. Zero-field (ZF) μSR data reveal that this system is a time-reversal invariant superconductor, and systematic transverse-field (TF) μSR 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 \textit{initio} band structure and phonon calculations are performed, which correlate with the experimental characterization.
@article{arxiv.2512.17282,
title = {Probing the intermediate state of type-I superconductor SnAs using Muon Spin Spectroscopy},
author = {Shashank Srivastava and Omkar Kulkarni and Arushi and Deepak Singh and Poulami Manna and Priya Mishra and Suhani Sharma and Pabitra Kumar Biswas and Rhea Stewart and Adrian D. Hillier and Ravi Prakash Singh},
journal= {arXiv preprint arXiv:2512.17282},
year = {2025}
}