Some Magnetic Properties of the Chromium (III) Halides at 4.2°K

Abstract

Magnetization curves for ${\mathrm{CrF}}_3$ , ${\mathrm{CrBr}}_3$ , and ${\mathrm{CrI}}_3$ at 4.2°K have been determined for fields up to 16 kilogauss. ${\mathrm{CrF}}_3$ exhibits hysteresis with a remanent moment of 0.04 Bohr magneton, and a saturation moment of ca 0.1. ${\mathrm{CrF}}_3$ is evidently ferrimagnetic. ${\mathrm{CrBr}}_3$ exhibits no hysteresis, and below 350 gauss the magnetization is strictly linear with field. ${\mathrm{CrI}}_3$ exhibits pronounced hysteresis not fully developed at 16 kilogauss. The expected saturation moment of 3 Bohr magnetons is compatible with the curves for ${\mathrm{CrBr}}_3$ and ${\mathrm{CrI}}_3$ .