Superconducting proximity effect in topological kagome antiferromagent Mn3Sn

Topological superconductivity (TSC) with triplet pairing is of intense interests for topological quantum computing and superconducting spintronics. One route to the realization of TSC is to explore novel proximal superconductivity with real space or momentum space spin textures. Topological kagome antiferromagnet Mn3Sn is a promising contender because of its exotic topological band structures and rich real space non-collinear spin textures. In this work, we report the prominent superconducting proximity effect in Mn3Sn/Nb bilayer films. In comparison with single Nb control samples, we found steplike superconducting transitions, distinct dependence of the transition temperatures on Nb thickness, increases of coherence length, and signs of violation of Pauli paramagnetic limit, suggesting potential proximity-induced triplet pairing in the bilayer films.