Abstract
Measurements of the magnetic susceptibility, magnetic moment and specific heat of holmium phosphate, HoPO4, show that there is a magnetic phase transition to an antiferromagnetic state at a Neel temperature of 1.39 K. The measurements indicate that the g value of the Ho3+ ion is highly anisotropic with gc=16.0, ga=ga'=0, and the overall behaviour may be well described in terms of the Ising model. At TN there is a typical lambda anomaly in the specific heat curve whereas at lower temperatures there is a pronounced contribution due to the nuclear hyperfine interaction. It is proposed that the ordered state is a simple two sub-lattice arrangement with the axis of alignment corresponding to the tetragonal c axis. This supposition is confirmed by a measurement of the magneto-electric susceptibility.
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