On mechanism of high-temperature superconductivity in hydrogen sulfide at 200 GPa: transition into superconducting anti-adiabatic state in coupling to H-vibrations

TL;DR

This paper explains how hydrogen sulfide under high pressure transitions into a high-temperature superconducting state due to coupling with hydrogen vibrations, shifting from an adiabatic to an anti-adiabatic regime at around 200 K.

Contribution

It introduces a theoretical model showing the transition to a stabilized anti-adiabatic multi-gap superconducting state in hydrogen sulfide at high pressure.

Findings

Transition to anti-adiabatic state at ~200 K

Superconducting gap formation due to H-vibrations

High critical temperature potential in H2S under pressure

Abstract

We have shown that adiabatic electronic structure of superconducting phase of sulphur hydride at 200 GPa is unstable toward vibration motion of H-atoms. Theoretical study indicates that in coupling to H-vibrations, system undergoes transition from adiabatic into stabilised anti-adiabatic multi-gap superconducting state at temperature which can reach 203 K.