Linear and isotropic magnetoresistance of Co$_{1-x}$Fe$_x$Si at x=0.2; 0.4; 0.65

TL;DR

This study investigates the magnetoresistance behavior of Co$_{1-x}$Fe$_x$Si compounds with different Fe concentrations, revealing quasilinear MR dependence and isotropic properties likely linked to Weyl electron spectra and disorder.

Contribution

It provides the first detailed analysis of MR in Co$_{1-x}$Fe$_x$Si across multiple compositions and temperatures, highlighting the role of Weyl spectra and disorder.

Findings

MR is quasilinear at low temperatures

MR is practically isotropic in these compounds

Weyl electron spectra and disorder influence MR behavior

Abstract

We studied the magnetoresistance (MR) of well-characterized samples of Co$_{1-x}$Fe$_x$Si at x=0.2, 0.4, and 0.65 at temperatures between 1.8 and 100~K and magnetic fields of 9~T. The quasilinear dependence of MR on the magnetic field at low temperatures and the practically isotropic properties of MR in these compounds are tentatively attributed to the specifics of Weyl electron spectra and general disorder of the materials.