The valence-skipped superconductors are natural candidates for unconventional superconductivity, as they can exhibit a negative effective, attractive interaction for electron-pairing. This work reports comprehensive XRD, magnetization, specific heat and muon spin rotation and relaxation measurements (μSR) on a valence-skipped compound: AgSnSe2. The temperature dependence of the electronic specific heat (Cel(T)) and of the upper critical field (Hc2(T)) provide evidence of two-gap superconductivity, which is also confirmed by our transverse-field μSR measurements. Our zero-field μSR measurements suggest preserved time-reversal symmetry in the superconducting ground state of AgSnSe2.
@article{arxiv.2302.07790,
title = {Superconducting ground state study of valence skip compound AgSnSe$_2$},
author = {A. Kataria and Arushi and S. Sharma and T. Agarwal and M. Pula and J. Beare and S. Yoon and Y. Cai and K. M. Kojima and G. M. Luke and R. P. Singh},
journal= {arXiv preprint arXiv:2302.07790},
year = {2023}
}