Magnetotransport studies of EuFe$_2$As$_2$: the influence of the Eu$^{2+}$ magnetic moments

TL;DR

This study investigates how Eu$^{2+}$ magnetic moments influence the electronic transport in EuFe$_2$As$_2$, revealing that their impact on resistivity and Hall effect is minimal under various conditions.

Contribution

It provides a detailed analysis showing Eu$^{2+}$ moments have limited effect on transport properties, using combined resistivity, Hall, and magnetization measurements with theoretical modeling.

Findings

Eu$^{2+}$ moments minimally affect resistivity and Hall effect.

Electron scattering by Eu$^{2+}$ moments is minor in EuFe$_2$As$_2$.

Transport properties are largely governed by other factors.

Abstract

We report resistivity $\rho$ and Hall effect measurements on EuFe$_2$As$_2$ at ambient pressure and 28 kbar and magnetization measurements at ambient pressure. We analyze the temperature and magnetic-field dependence of $\rho$ and the Hall effect using a molecular-field theory for magnetoresistance and an empirical formula for the anomalous Hall effect and find that electron scattering due to the Eu$^{2+}$ local moments plays only a minor role in determining electronic transport properties of EuFe$_2$As$_2$.