A Possible Mechanism of the Pseudogap in Organic Superconductor Based on the Superconducting Fluctuation

TL;DR

This paper proposes a mechanism for the pseudogap in organic superconductors, attributing it to superconducting fluctuations and damping effects, which could explain experimental observations and similarities with cuprates.

Contribution

It introduces a theoretical model using one-loop approximation to explain the pseudogap phenomenon in quasi-two-dimensional organic superconductors.

Findings

Density of states decreases due to damping effects

Pseudogap structure appears around the Fermi level

Behavior is enhanced in incoherent metallic states

Abstract

The explanation of the anomalous behavior in $\kappa$-type (BEDT-TTF)$_2$X which was revealed by the nuclear magnetic resonance experiments is presented. We calculate the electronic properties by using the one-loop approximation for the superconducting fluctuation. The decrease of the density of states due to the large damping effect is obtained and the one-particle spectrum has a pseudogap structure around the Fermi level. It is found that these behaviors are peculiar to the quasi two-dimensional system and are enhanced in the incoherent metal. The similarity between the cuprates and this compounds is discussed and an experiment to check this proposal is suggested.