Towards room-temperature superconductivity

TL;DR

This paper proposes a method to estimate the critical temperature for superconductivity using microscopic parameters, highlighting the importance of electron concentration and coupling for achieving higher $T_c$ and understanding high-$T_c$ materials.

Contribution

It introduces a stability criterion to calculate $T_c$ based on band structure and electron interactions, offering insights into high-temperature superconductivity.

Findings

$T_c$ strongly depends on electron concentration.

Inter-electron coupling significantly influences $T_c$.

The approach provides a practical route to higher $T_c$ values.

Abstract

By taking advantage of a stability criterion established recently, the critical temperature $T_c$ is reckoned with help of the microscopic parameters, characterising the normal and superconducting electrons, namely the independent-electron band structure and a \textit{repulsive} two-electron force. The emphasis is laid on the sharp $T_c$ dependence upon electron concentration and inter-electron coupling, which might offer a practical route toward higher $T_c$ values and help to understand why high-$T_c$ compounds exhibit such remarkable properties.