Angular dependence of the Hall effect of lsmo films

TL;DR

This study investigates the angular dependence of the Hall effect in La0.7Sr0.3MnO3 films, revealing an unexpected term in the resistivity that suggests an intrinsic transport property.

Contribution

It identifies a novel angular dependence term in the Hall effect of LSMO films, indicating an intrinsic transport phenomenon not explained by magnetization or longitudinal resistivity.

Findings

The Hall resistivity varies with angle as a combination of cos θ and cos 3θ.

The coefficient of the cos 3θ term increases with temperature.

The cos 3θ term decreases with increasing magnetic field.

Abstract

We find that the Hall effect resistivity ($\rho_{xy}$) of thin films of \lsmo\ varies as a function of the angle $\theta$ between the applied magnetic field and the film normal as $\rho_{xy}=a\cos \theta + b\cos 3\theta$, where $|b|$ increases with increasing temperature and decreases with increasing magnetic field. We find that the angular dependence of the longitudinal resistivity and the magnetization cannot fully explain the surprising term $b$, suggesting it is a manifestation of an intrinsic transport property.