Transport Anomalies Associated with the Pseudogap From a Preformed Pair Perspective

TL;DR

This paper investigates transport anomalies in the pseudogap phase of high-temperature superconductors using a preformed pair model, explaining experimental observations of diamagnetic susceptibility and conductivity.

Contribution

It provides a physically transparent 3D preformed pair framework that reconciles experimental inconsistencies in transport properties near the superconducting transition.

Findings

Preformed pairs significantly contribute to diamagnetic susceptibility.

Imaginary conductivity is suppressed near the critical temperature.

The model aligns with experimental observations of transport anomalies.

Abstract

Transport studies seem to be one of the strongest lines of support for a preformed pair approach to the pseudogap. In this paper we provide a fresh, physically transparent look at two important quantities: the diamagnetic susceptibility and conductivity. We use a three dimensional preformed pair framework which has had some success in the cold Fermi gases and in the process we reconcile recently observed inconsistencies. Specifically, while the preformed pairs in our theory give a large contribution to the diamagnetic susceptibility, the imaginary part of the conductivity is suppressed to zero much closer to $T_c$, as is observed experimentally.