Normal and superconducting properties of LiFeAs explained in the framework of four-band Eliashberg Theory

TL;DR

This paper models the normal and superconducting properties of LiFeAs using a four-band Eliashberg theory, confirming its multiband nature and identifying antiferromagnetic spin fluctuations as the key mechanism.

Contribution

It introduces a four-band Eliashberg model that successfully reproduces experimental superconducting and normal state properties of LiFeAs, highlighting antiferromagnetic spin fluctuations as the main pairing mechanism.

Findings

Multiband nature confirmed by experimental data

Estimated spin fluctuation coupling constants: 2.00 (superconducting), 0.77 (normal)

Model reproduces temperature-dependent gaps and resistivity

Abstract

In this paper we propose a model to reproduce superconductive and normal properties of the iron pnictide LiFeAs in the framework of the four-band spm wave Eliashberg theory. A confirmation of the multiband nature of the system rises from the experimental measurements of the superconductive gaps and resistivity as function of temperature. We found that the most plausible mechanism is the antiferromagnetic spin fluctuation and the estimated values of the total antiferromagnetic spin fluctuation coupling constant in the superconductive and normal state are lambda{tot}=2.00 and lambda{tot,tr}=0.77.