Our latest work shows that the same theoretical tools that successfully explain other hydride systems under pressure seem to be at odds with the recently claimed conventional room-temperature superconductivity of carbonaceous sulfur hydride (CSH).
Our published article concludes that (1) the absence of a dominant low-enthalpy stoichiometry and crystal structure in the ternary phase diagram. (2) Only the thermodynamics of C-doping phases appears to be marginally competing in enthalpy against H3S. (3) Accurate results of the transition temperature given by ab initio Migdal-Eliashberg calculations differ by more than 110 K from recent theoretical claims explaining the high-temperature superconductivity in carbonaceous hydrogen sulfide.
Perhaps an unconventional mechanism of superconductivity or a breakdown of current theories in this system is possibly behind the disagreement. This work is now published in Phs. Rev. B.
This work represents a great effort from Wang-kun, a PhD Student at the University of Tokyo.
Caption: Transition temperature vs pressure: Theoretical results (this work) are estimated using different methods. Experimental results reported by Dias’s group on C-S-H, Eremets’s group on H-S and D-S and theoretic results on H3S are also shown. Independent of the methodology used, our results suggest a sizable deviation as large as 110 K between the most reliable theoretical estimations and experiments on Tc.