Abstract
The magnetic behavior of ${\mathrm{UBr}}_{3}$ is explained by an anisotropic exchange molecular field model. The two magnetic phase transitions at ${T}_{N}$=5.3 K and ${T}_{t}$=3 K are obtained as a result of mini- mizing the free energy with respect to the relative occupation probabilities of crystal-field levels. Below ${T}_{t}$ all U-ion moments are ordered; for ${T}_{t}$${T}_{N}$ only (2/3 of them are ordered. The entropy of the disordered moments is identified as the agent of the transition at ${T}_{t}$. Good agreement with experimental results is obtained.
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