Magnetotransport in overdoped La$_{2-x}$Sr$_x$CuO$_4$: Effect of anisotropic scattering

TL;DR

This paper demonstrates that incorporating anisotropic scattering due to apical oxygen vacancies in a Fermi liquid framework explains various anomalous magnetotransport phenomena observed in overdoped La$_{2-x}$Sr$_x$CuO$_4$, aligning theory with experiments.

Contribution

The study introduces a theoretical model including anisotropic scattering effects, improving the understanding of magnetotransport anomalies in overdoped cuprates beyond isotropic assumptions.

Findings

Reproduces the upturn of Hall coefficient $R_H$ with decreasing temperature.

Explains the initial drop of $R_H$ in magnetic field across overdoped regimes.

Accounts for linear resistivity versus magnetic field near van Hove doping.

Abstract

We revisit the Hall effect and magnetoresistivity by incorporating the anisotropic scattering caused by apical oxygen vacancies in overdoped La-based cuprates. The theoretical calculations within the Fermi liquid picture agree well with a handful of anomalous magneto-transport data, better than the results using an isotropic scattering rate alone. In particular, we obtain the upturn of Hall coefficient $R_H$ with decreasing temperature $T$, the initial drop of $R_H$ in magnetic field $B$ in all overdoped regimes, the linear resistivity $\rho$ versus $B$ near the van Hove doping level, the temperature dependence of the magnetoresistivity ratio, and the violation of Kohler's law. These results suggest that many of the anomalous transport behaviors in overdoped La$_{2-x}$Sr$_x$CuO$_4$ could actually be understood within the Fermi liquid picture.