Anomalous normal-state properties of iron pnictides: phenomenological theory

TL;DR

This paper presents a phenomenological two-band model incorporating spin-fluctuation effects to explain anomalous normal-state transport properties in electron-doped iron pnictides, aligning well with experimental data.

Contribution

It introduces a simplified two-band phenomenological framework that accounts for non-Fermi-liquid spin fluctuations to describe transport anomalies in iron pnictides.

Findings

Resistivity, thermopower, and Hall constant behaviors are explained.

The model successfully reproduces experimental temperature dependencies.

Non-Fermi-liquid spin fluctuations are key to understanding anomalies.

Abstract

We employ the phenomenological theory of the quasiparticle relaxation based on the simplified two-band description and the spin-fluctuation induced interband coupling to analyze recent normal-state transport data in electron-doped iron pnictides, in particular the Ba(Fe_1-x Co_x)_2As_2 family. Temperature dependence of the resistivity, thermopower and the Hall constant are evaluated. It is shown that their anomalous behavior emerging from experiments can be consistently described within the same framework assuming also non-Fermi-liquid spin fluctuations.