Superconductivity driven by pairing of the coherent parts of the physical electrons

TL;DR

This paper proposes that superconductivity in unconventional superconductors arises from the pairing of the low-energy coherent parts of physical electrons, which survive interaction correlations, providing a unified explanation for diverse normal states.

Contribution

It introduces a theory that superconductivity is driven by pairing of coherent electron parts, reconciling diverse normal states with BCS-like behavior in unconventional superconductors.

Findings

Superconductivity is driven by pairing of the coherent parts of physical electrons.

Incoherent parts can enhance the transition temperature $T_c$.

Predictions are made for experimental responses of coherent electron parts.

Abstract

How the superconductivity in unconventional superconductors emerges from the diverse mother normal states is still a big puzzle. Whatever the mother normal states are the superconductivity is {\em normal} with BCS-like behaviours of the paired quasiparticles in condensation. To reconcile the diverse mother normal states and the normal superconductivity in unconventional superconductors, we revisit a proposal that the emergence of the low-energy coherent parts of the physical electrons, which survive from the interaction correlations, is an essential prerequisite for superconductivity. The superconductivity is driven by the pair condensation of these coherent parts of the physical electrons. Moreover the incoherent parts of the physical electrons can enhance the superconducting transition temperature $T_c$ although they are not in driving role in the emergence of the superconductivity. Some experimental responses of the coherent parts of the physical electrons are predicted.