We report the pressure dependence of the Fermi surfaces (FSs) of CeSb in an intermediate antiferromagnetic phase. The dHvA frequencies arising from electron FSs increase monotonically with pressure. On the other hand, the frequency arising from a large hole surface increases, while those of small hole FSs decrease with pressure up to 2 kbar and then increase with pressure. The results are discussed in the light of the observations in the ferromagnetic phase and the p-f mixing model.
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