A phenomenological model free energy is used to interpret the magnetic phase diagram of dhcp neodymium derived from recent neutron diffraction and thermal expansion measurements. First-order transitions at TN=19.9 K and at T₂=19.1 K are to multidomain single-q and double-q modulated structures, respectively. The observed magnetic field dependence of these phases is in accord with the predictions of the model.
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McEwen et al. (1986) studied this question.
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