Comparison of highly-compressed2/-SnHsuperhydride with conventional superconductors.

Satterthwaite and Toepke (1970741) predicted high-temperature superconductivity in hydrogen-rich metallic alloys, based on an idea that these compounds should exhibit high Debye frequency of the proton lattice, which boosts the superconducting transition temperature,. The idea has got full confirmation more than four decades later when Drozdov(201573) experimentally discovered near-room-temperature superconductivity in highly-compressed sulphur superhydride, HS. To date, more than a dozen of high-temperature hydrogen-rich superconducting phases in Ba-H, Pr-H, P-H, Pt-H, Ce-H, Th-H, S-H, Y-H, La-H, and (La, Y)-H systems have been synthesized and, recently, Hong(2021:2101.02846) reported on the discovery of2/-SnHphase with superconducting transition temperature of∼ 70 K. Here we analyse the magnetoresistance data,(,), of2/-SnHphase and report that this superhydride exhibits the ground state superconducting gap of Δ(0) = 9.2 ± 0.5 meV, the ratio of 2Δ(0)/= 3.3 ± 0.2, and 0.010 </< 0.014 (whereis the Fermi temperature) and, thus,2/-SnHfalls into unconventional superconductors band in the Uemura plot.