Abstract
Thermal expansion and magnetisation measurements have been performed on a single crystal of HoAl 2 between 4 and 300K. A sharp spontaneous volume anomaly has been observed at the spin re-orientation temperature where the easy direction of magnetisation changes from [101] to [010]. A model incorporating single-ion crystal field, exchange and magnetoelastic contributions has been found which adequately explains the temperature dependence of the anomalous volume distortion. From a fit to the experimental data, the magnetoelastic coupling constants M α 4 and M α 6 have been determined.
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