Abstract
We report ac and dc susceptibility measurements of single crystals of the axial dipolar paramagnet Ho(C2H5SO4)3·9H2O between 10 mK and 1 K. This material has hexagonal symmetry, with a non-Kramers doublet ground state possessing a very anisotropic g factor, to which the Ising model might be expected to apply: g||=15.41, g⊥=0. An antiferromagnetic transition was observed at ∼215 mK. This is in marked contrast to two related compounds with Ising model interactions, Dy(C2H5SO4)3·9H2O and Tb(C2H5SO4)·9H2O, both of which order ferromagnetically. A possible reason for the difference is the hyperfine interaction, which is large in holmium.
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