In-field resistive transition of highly-compressed superconducting hydrides
*Evgeny Talantsev1,2, Karoline Stolze3

Critical temperature, Tc, and transition width, ΔTc, are two primary parameters of the superconducting transition. The transition width reflects the superconducting state disturbance originating from the thermodynamic fluctuations, atomic disorder, applied magnetic field, the presence of secondary phases, etc. Recently, Hirsch and Marsiglio (2021 Phys. Rev. B 103 134505) reported that the reduced transition width, ΔTc/Tc, in several near-room-temperature superconductors (NRTS) does not follow a conventional trend of broadening on applied magnetic field, which is observed in low- and high-Tc superconductors. Here we present thorough mathematical analysis of the magnetoresistive data, R(T,B), for the high-entropy alloy (ScZrNb)0.65[RhPd]0.35 and highly-compressed hydrogen-rich superconductors of Im-3m-H3S, C2/m-LaH10, P63/mmc-CeH9 and C2/m-SnH12. We found that the reduced transition width, ΔTc/Tc, in all studied superhydrides does follow a conventional broadening trend on applied magnetic field.

Keywords: Hydrogen-Rich Superconductors, Resistive Superconducting Transition , Upper Critical Field