\b{eta}-PdBi2 has attracted much attention for its prospective ability to possess simultaneously topological surface and superconducting states due to its unprecedented spin-orbit interaction (SOC). Whereas most works have focused solely on investigating its topological surface states, the coupling between spin and charge degrees of freedom in this class of quantum material remains unexplored. Here we first report a study of spin-to-charge conversion in a \b{eta}-PdBi2 ultrathin film grown by molecular beam epitaxy, utilizing a spin pumping technique to perform inverse spin Hall effect measurements. We find that the room temperature spin Hall angle of Fe/\b{eta}-PdBi2, {\theta}_SH=0.037. This value is one order of magnitude larger than that of reported conventional superconductors, and is comparable to that of the best SOC metals and topological insulators. Our results provide an avenue for developing superconductor-based spintronic applications.
@article{arxiv.2007.08693,
title = {Large spin to charge conversion in topological superconductor \b{eta}-PdBi2 at room temperature},
author = {Yang Li and Shi-jia Yang and Dali Sun and Yun-bin Sun and Yan Li and Eric Vetter and Rui Sun and Na Li and Xu Yang and Lei Su and Zi-zhao Gong and Zong-kai Xie and Jian-jun Zhao and Wei He and Xiang-qun Zhang and Zhao-hua Cheng},
journal= {arXiv preprint arXiv:2007.08693},
year = {2020}
}