Critical temperature, T_c, and transition width, ΔT_c, 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, ΔT_c/T_c, 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-T_c 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, ΔT_c/T_c, in all studied superhydrides does follow a conventional broadening trend on applied magnetic field.

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