Role of Dirac cones in magnetotransport properties of REFeAsO (RE=rare earth) oxypnictides

TL;DR

This study combines theoretical calculations and experimental measurements to investigate how Dirac cones influence the magnetotransport properties in REFeAsO oxypnictides, revealing their significant role in electronic behavior.

Contribution

It provides a comprehensive analysis of the impact of Dirac cones on transport properties in REFeAsO compounds, integrating DFT calculations with experimental data.

Findings

Dirac cones are present along specific directions in the band structure.

Transport measurements confirm the dominant role of Dirac cones.

Effective masses and Fermi velocities vary with different rare earth elements.

Abstract

In this work we study the effect of the rare earth element in iron oxypnictides of composition REFeAsO (RE=rare earth). On one hand we carry out Density Functional Theory calculations of the band structure, which evidence the multiband character of these compounds and the presence of Dirac cones along the Y-{\Gamma} and Z-R directions of the reciprocal space. On the other hand, we explore transport behavior by means of resistivity, Hall resistance and magnetoresistance measurements, which confirm the dominant role of Dirac cones. By combining our theoretical and experimental approaches, we extract information on effective masses, scattering rates and Fermi velocities for different rare earth elements.