Abstract
Among the cerium monopnictides, all of which show different magnectic character1, CeBi and CeSb exhibit extremely unusual magnetic properties2. Tetragonal distortions take place in both materials at the Neel temperature3, below which the alignments of all sub-lattice magnetic moments hold fast to the [001] direction through the many successive magnetically ordered phases induced by external magnetic fields. In both compounds, the effective crystalline field is unusually small compared with other cerium monopnictides. Nevertheless, CeBi and CeSb show strong magnetic anisotropies favoring the [001] direction4,5. Recently we proposed a model based on the anisotropic p-f mixing mechanisms and obtained a better understanding of the common salient features observed in both compounds6.
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