Using a simple but nevertheless sensitive experimental arrangement the ac susceptibility of HoAsO4 was studied near its paramagnetic to antiferromagnetic phase transition at TN = 0.559 K. By these measurements concerning with the temperature and the magnetic field dependence of the susceptibility Fisher's theory connecting the specific heat and the reduced susceptibility of an antiferromagnet could be verified. Both the exchange and dipolar fields are given.
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Becher et al. (1973) studied this question.
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