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

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 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 H/T<7 kG/^∘{}K in the range 1.2^∘K<~T<~4.2^∘K, thus substantiating one of the basic assumptions of the existing magnetic temperature scale for $T>~6$ mdeg K.