Resistive transition of hydrogen-rich superconductors

Critical temperature, $T_c$, and the transition width, $\Delta$$T_c$, are two primary parameters of the superconducting transition. The latter parameter reflects a level of the superconducting state disturbance originating from the thermodynamic fluctuations, atomic disorder, applied magnetic field, the presence of secondary crystalline phases, applied pressure, etc. Recently, Hirsch and Marsiglio (2020 arXiv:2012.12796) performed an analysis of the transition width in several near-room-temperature superconductors (NRTS) and reported that the reduced transition width, $\Delta$$T_c$$/$$T_c$, in these materials does not follow a conventional broadening trend on applied magnetic field, as this is the case for many low- and high-$T_c$ superconductors. Here we perform thorough mathematical analysis of the magnetoresistive data, $\it{R(T,B)}$, for the high-entropy alloy $(ScZrNb)_{0.65}$$[RhPd]_{0.35}$ and hydrogen-rich superconductors of Im-3m-$H_{3}S$, C2/m-$LaH_{10}$ and P63/mmc-$CeH_9$ and find that the reduced transition width, $\Delta$$T_c$$/$$T_c$, in these materials does follow a conventional broadening trend on applied magnetic field.