Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: Properties and Electronic Structure
TT 14.9: Vortrag
Montag, 9. März 2026, 17:15–17:30, HSZ/0103
Probing the intermediate state of the type-I topological superconductor SnAs using Muon Spin Spectroscopy — •Shashank Srivastava1, Omkar Kulkarni1, Arushi Arushi1, Deepak Singh2, Adrian D. Hillier2, and Ravi Prakash Singh1 — 1Indian Institute of Science Education and Research, Bhopal 462066, India — 2ISIS Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
The possibility of topological superconductivity in a type-I superconductor embraces exotic physics. The topological semimetal SnAs shows superconductivity below 3.6 K, but there is ambiguity in the nature of superconductivity. Some reports claim type-I superconductivity in SnAs, but recent studies contradict it. We have resolved this enigma using a thorough microscopic analysis of the superconducting ground state.
In this work, we report the muon spin rotation/relaxation (μSR) study of the possible topological superconductor SnAs. The zero-field (ZF) μSR data reveal that this system is a time-reversal-invariant superconductor. The systematic transverse field (TF) μSR measurements unveil the type-I superconductivity and the intermediate state using the superconducting phase diagram for SnAs. Moreover, ab initio calculations of band structure and phonons were performed, which correlate with the basic experimental characterization. Our study opens a platform for understanding the underlying physics behind the origin of topological superconductivity in type-I superconductors.
Keywords: Superconductivity; Topological semimetal; Muon spin spectroscopy; Topological superconductivity; Type-I superconductor