We report the ac magnetic susceptibility, electrical resistance, and x-ray diffraction measurements of PtHₓ4pt0ex(x1) in diamond anvil cells, that reveal the superconducting transition. At 30 GPa, when PtHₓ is in a P6₃/mmc structure, PtHₓ exhibits the superconducting transition at 7 K. Remarkably, the observed Tc is higher than that of powdered Pt by more than three orders of magnitude. It is suggested that the noble metals in the periodic table of elements possibly form a region where hydrides have higher Tc than elements.
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Matsuoka et al. (2019) studied this question.
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