Studying the Magnetic Properties of CoSi Single Crystals

TL;DR

This study investigates the magnetic behavior of CoSi single crystals across a broad temperature range, identifying intrinsic diamagnetic properties and the effects of impurities and defects on magnetic susceptibility.

Contribution

It provides a detailed comparison of magnetic susceptibility in ideal and real CoSi crystals, highlighting the intrinsic diamagnetic nature and impurity effects.

Findings

Ideal CoSi exhibits diamagnetism across all temperatures.

Real crystals show paramagnetic contributions and nonlinear magnetization effects.

Susceptibility increases with decreasing temperature and saturates at low temperatures.

Abstract

The magnetic properties of CoSi single crystals have been measured in a range of temperatures $T = 5.5 - 450$ K and magnetic field strengths $H \leq 11$ kOe. A comparison of the results for crystals grown in various laboratories allowed the temperature dependence of magnetic susceptibility $\chi(T) = M(T)/H$ to be determined for a hypothetical "ideal" (free of magnetic impurities and defects) CoSi crystal. The susceptibility of this ideal crystal in the entire temperature range exhibits a diamagnetic character. The $\chi(T)$ value significantly increases in absolute value with decreasing temperature and exhibits saturation at the lowest temperatures studied. For real CoSi crystals of four types, paramagnetic contributions to the susceptibility have been evaluated and nonlinear (with respect to the field) contributions to the magnetization have been separated and taken into account in the calculations of $\chi(T)$.