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Recent experiments have set a new record for the transition temperature at which a material (hydrogen sulfide, H 3 S) becomes superconducting. Moreover, a pronounced isotope shift of  T   C   in D 3 S is evidence of an existence of phonon-mediated pairing mechanism of superconductivity that is consistent with the well established Bardeen-Cooper-Schrieffer scenario. Herein, we reported a theoretical studies of the influence of the substitution of  32 S atoms by the heavier isotopes  33 S,  34 S and  36 S on the electronic properties, lattice dynamics and superconducting critical temperature of H 3 S. There are two equally fundamental results presented in this paper. The first one is an anomalous sulfur-derived superconducting isotope effect, which, if observed experimentally, will be subsequent argument that proves to the classical electron-phonon interaction. The second one is fact that critical temperature rise to extremely high value of 242 K for H 3  36 S at 155 GPa. This result brings us closer to the room temperature superconductivity.

Unusual sulfur isotope effect and extremely high critical temperature in H3S superconductor