Dynamical Screening and Superconducting State in Intercalated Layered Metallochloronitrides

TL;DR

This paper demonstrates that dynamical screening effects, particularly acoustic plasmons, significantly enhance superconductivity in intercalated metallochloronitrides, explaining their high critical temperatures.

Contribution

It introduces the role of dynamical screening and collective modes in increasing Tc in layered superconductors, a novel insight beyond traditional electron-phonon mechanisms.

Findings

Dynamical screening explains high Tc in metallochloronitrides.

Acoustic plasmons enhance superconducting pairing.

Theoretical Tc matches experimental values (~26K).

Abstract

An essential property of layered systems is the dynamical nature of the screened Coulomb interaction. Low energy collective modes appear as a consequence of the layering and provide for a superconducting-pairing channel in addition to the electron-phonon induced attractive interaction. We show that taking into account this feature allows to explain the high critical temperatures (Tc~26K) observed in recently discovered intercalated metallochloronitrides. The exchange of acoustic plasmons between carriers leads to a significant enhancement of the superconducting critical temperature that is in agreement with the experimental observations.