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We present detailed studies of the superconductivity in high-pressure H3S.X-ray diffraction measurements show that cubic Im-3m H3S was synthesized fromelemental sulfur and hydrogen donor ammonia borane (NH3BH3). Our electricaltransport measurements confirm superconductivity with a transition temperatureTc = 197 K at 153 GPa. From the analysis of both the normal state resistivityand the slope of the critical field, we conclude that the superconductivity isdescribed by clean-limit behaviour. A significant broadening of the resistivetransition in finite magnetic field is found, as expected for superconductors.We identify a linear temperature-over-field scaling of the resistance at thesuperconducting transition which is not described by existing theories.

Clean-limit superconductivity in Im-3m H3S synthesized from sulfur and hydrogen donor ammonia borane