We report the ac magnetic susceptibility, electrical resistance, and X-ray diffraction measurements of platinum hydride (PtHx) in diamond anvil cells, which reveal its superconducting transition. At 32 GPa, when PtHx is in a P63/mmc structure, PtHx exhibits superconducting transition at 6.7 K and superconducting transition temperature (Tc) decreases with pressure to 4.8 K at 36 GPa. The observed T c is higher than that of powdered Pt by more than three orders of magnitude. It is suggested that hydrides of noble metals have higher Tc than the elements.
@article{arxiv.1810.08191,
title = {Superconductivity of platinum hydride},
author = {Takahiro Matsuoka and Masahiro Hishida and Keiji Kuno and Naohisa Hirao and Yasuo Ohishi and Shigeo Sasaki and Kazushi Takahama and Katsuya Shimizu},
journal= {arXiv preprint arXiv:1810.08191},
year = {2019}
}