Measurements as a function of both magnetic field and temperature along with first principles spin polarized calculations explain the remarkable magnetoelastic properties exhibited by GdNi below its Curie temperature. The lattice constants a and b elongate continuously by 0.35% and 0.49%, respectively, while the c axis contracts by 0.78%, all without phase volume change. Calculations and experiment confirm a relatively shallow magnetization-dependent energy landscape modified by the increased spin splitting of the conduction band as the $4f$ moments order.
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Paudyal et al. (2008) studied this question.
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