Has room temperature superconductivity really been achieved?

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.