Abstract
The optical absorption spectrum of Ho 3+ in HoPO 4 and HoAsO 4 and the specific heat of HoAsO 4 has been studied to obtain information on magnetic and hyperfine interactions in these substances. Both substances are Ising systems which order antiferromagnetically in a simple two-sublattice structure with magnetic moment direction parallel to the optical axis at T N = 1.39K and 0.557 K, respectively. The interactions to nearest (nn), next nearest (nnn), and third nearest neighbours (tnn) were estimated. The most striking result is that the exchange interaction to the nearest neighbours was found to be ferromagnetic however cancelled by the third nearest neighbour's exchange interaction in HoAsO 4 and even overcompensated in HoPO 4.
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