Dominant role of impurity scattering over crystalline anisotropy for magnetotransport properties in the quasi-1D Hollandite Ba1.2Rh8O16

TL;DR

This study investigates the magnetotransport properties of quasi-1D Hollandite Ba1.2Rh8O16, revealing impurity scattering as the dominant factor over crystalline anisotropy, with evidence pointing to a spin-driven Kondo effect.

Contribution

It demonstrates that impurity scattering, not crystalline anisotropy, primarily influences low-temperature magnetotransport in Ba1.2Rh8O16, and identifies a spin-driven Kondo effect.

Findings

Impurity scattering dominates low-temperature transport.

Negative magnetoresistance is isotropic and likely spin-driven.

Galvanomagnetic behavior is consistent with a 3D Kondo effect.

Abstract

Angular magnetotransport measurements have been performed to tackle the origin of the magnetoresistance in the quasi-1D Hollandite Ba1.2Rh8O16. Three samples of different impurities amount were measured. We observe that the low temperature resistivity upturn is not due to a charge density wave transition, and a dominant role of impurities scattering for low temperature transport properties is instead demonstrated. The components of magnetoresistance were separated by using the Kohler plot and the angular dependency of the resistance under magnetic field. It shows the major contribution of an isotropic, likely spin driven, negative magnetoresistance. Galvanomagnetic characteristics are then consistent with a Kondo effect and appear to be essentially 3D at low temperature.