The magnetostriction of single-crystal NdAl 2 has been measured in fields up to 18 T along the easy (001) and hard (111) directions as a function of temperature. The measured strains can be explained by a single-ion Hamiltonian. The second-order magnetoelastic coefficients are found to be M 2 gamma =-31.7K ion -1 and M 2 epsilon =65.1+or-7.5K ion -1 . The ratio of these terms can be understood when the dominant interaction is between the 4f electrons and the surrounding lattice charge distribution.
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Abell et al. (1979) studied this question.
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