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The specific heat of crystalline samples of CexY1−xSb (x=1, 0.2, 0.1, and 0) and LaSb was measured for temperatures between 1.5° and 70°K. The Néel temperature of CeSb is found to be 16.0 (±0.2)°K. The magnetic specific heat between 1.5° and 3.8°K is proportional to T2. This temperature dependence is correlated with spin waves in the anisotropic magnetic structure of CeSb. The crystal-field splitting of the 2F5/2 ground state of the Ce3+ ion in CeSb is 24 (±2)°K.
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Busch et al. (1971) studied this question.
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