Non-adiabatic effects of superconductor silane under high pressure

TL;DR

This paper explores how non-adiabatic effects, especially in light-element superconductors like silane under high pressure, can suppress superconductivity and lower transition temperatures compared to standard predictions.

Contribution

It introduces vertex corrections into Eliashberg theory to analyze non-adiabatic effects on high-pressure silane superconductors, revealing their impact on transition temperatures.

Findings

High phonon frequency is unfavorable for superconductivity with strong vertex corrections.

Non-adiabatic effects reduce the predicted transition temperature of silane.

Interplay between non-adiabatic and Coulomb interactions influences superconducting properties.

Abstract

Investigations of non-adiabatic effects by including vertex corrections in the standard Eliashberg theory show that high phonon frequency is unfavorable to superconductivity in regime of strong vertex correction. This means that it is hard to find high-transition-temperature superconductors in the compounds with light elements if the non-adiabatic effects are strong. The interplay interaction between non-adiabatic effect and Coulomb interaction makes the transition temperature of silane superconductor not so high as predicted by the standard Eliashberg theory.