Charge dynamics in the normal state of the iron oxypnictide superconductor LaFePO

TL;DR

This study investigates the charge dynamics of LaFePO, revealing it as a low carrier density metal with moderate correlations and electron-boson coupling, indicating coherent quasiparticles in its normal state.

Contribution

First infrared and optical analysis of LaFePO's normal state, highlighting its low carrier density, correlations, and electron-boson interactions.

Findings

Low carrier density metallic behavior

Signatures of electron-boson coupling

Presence of coherent quasiparticles

Abstract

We present the first infrared and optical study in the normal state of ab-plane oriented single crystals of the iron-oxypnictide superconductor LaFePO. We find that this material is a low carrier density metal with a moderate level of correlations and exhibits signatures of electron-boson coupling. The data is consistent with the presence of coherent quasiparticles in LaFePO.