High-Field Magnetization of Cerous Magnesium Nitrate: Implications to Low-Temperature Thermometry

Abstract

The magnetization of single-crystal cerous magnesium nitrate is found to deviate from the prediction of the commonly accepted ionic crystal-field model at large values of $\frac{H}{T}$. Although affecting the magnetic temperature scale for cerous magnesium nitrate at low temperatures in high magnetic fields, the present results are in agreement with the model for $\frac{H}{T}<7\mathrm{}$ kG/°K in the range $1.2°\mathrm{K}<~T<~4.2°\mathrm{K}$, thus substantiating one of the basic assumptions of the existing magnetic temperature scale for $T>~6$ mdeg K.