Magneto-thermal switching (MTS) is a key technology for efficient thermal management. Recently, large MTS with nonvolatility has been observed in Sn-Pb solders [H. Arima et al., Commun. Mater. 5, 34 (2024)] where phase separation, different superconducting transition temperature (Tc) of Sn and Pb, and magnetic-flux trapping are the causes of the nonvolatile MTS. To further understand the mechanism and to obtain the strategy for enhancing switching ratio, exploration of new phase-separated superconductors with nonvolatile MTS is needed. Here, we show that the In52-Sn48 commercial solder is a phase-separated superconducting composite with two Tc and traps vortices after field cooling. A clear signature of nonvolatile MTS was observed at T = 2.5 K. From specific heat analyses, we conclude that the vortices are mainly trapped in the lower-Tc phase ({\gamma}-phase) after field cooling, which is the evidence that vortex trapping also works on achieving nonvolatile MTS in phase-separated superconducting composites.
@article{arxiv.2408.14824,
title = {Nonvolatile magneto-thermal switching driven by vortex trapping in commercial In-Sn solder},
author = {Poonam Rani and Takumi Murakami and Yuto Watanabe and Hossein Sepehri-Amin and Hiroto Arima and Aichi Yamashita and Yoshikazu Mizuguchi},
journal= {arXiv preprint arXiv:2408.14824},
year = {2025}
}