Linear unsaturated magnetoresistance in YSi single crystal

TL;DR

This study reports on the anisotropic linear magnetoresistance in YSi single crystals, driven by mobility fluctuations, with evidence of multiple charge carriers and Fermi surface anisotropy, expanding understanding of magnetoresistance phenomena.

Contribution

First detailed investigation of linear magnetoresistance in YSi single crystals revealing anisotropic behavior and multiple charge carriers.

Findings

Linear magnetoresistance observed above 10 T in specific directions.

Anisotropy in Fermi surface evidenced by angular dependence.

Kohler rule violation indicates multiple charge carriers.

Abstract

Linear magnetoresistance is a phenomenon that has been observed in a few topological compounds that originate from classical and quantum phenomena. Here, we performed electrical transport measurements, in zero and applied magnetic fields, on the YSi single crystal along all three principal crystallographic directions of the orthorhombic crystal structure. For $I~\parallel~[001]$ and $H~\parallel~[100]$ direction above $\approx 10$~T, mobility fluctuation driven linear magnetoresistance is observed without any sign of saturation up to $14$~T magnetic field. Anisotropy in the Fermi surface is immanent from the angular dependence of the magnetoresistance. Kohler rule violation is observed in this system and Hall data signifies multiple charge carriers in YSi.