Analysis of transport properties of iron pnictides: spin-fluctuation scenario

TL;DR

This paper develops a phenomenological two-band model to explain the anomalously high resistivity and thermopower in iron pnictides as a result of strong spin fluctuation coupling, drawing parallels with cuprates.

Contribution

It introduces a simplified two-band model coupled via spin fluctuations to explain transport properties in iron pnictides, extending insights from cuprate physics.

Findings

Large anomalous resistivity explained by spin fluctuation coupling

Thermopower behavior attributed to strong spin fluctuation interactions

Model provides a basis for understanding normal and superconducting states

Abstract

We present a phenomenological theory of quasiparticle scattering and transport relaxation in the normal state of iron pnictides based on the simplified two-band model coupled via spin fluctuations. In analogy with anomalous properties of cuprates it is shown that a large and anomalous normal-state resistivity and thermopower can be interpreted as the consequence of strong coupling to spin fluctuations. The generalization to the superconducting phase is also discussed.