Abstract
The ac linear (X0) and nonlinear (X2) susceptibilities of an elemental ferromagnetic gadolinium have been studied at temperatures near the Curie temperature TC to clarify the feature of the magnetic phase transition, with special emphasis on the behavior at temperatures below TC. The temperature dependence of X0 is in good agreement with an experimental result reported in several references. The first observation for the critical behavior of X2 in gadolinium has been made at various field amplitudes. The behavior of nonlinear susceptibility is very sensitive to the field’s amplitude. The temperature dependence of X2 at temperatures below TC is not in agreement with some theoretical expectations and several experimental results for other ferromagnets.
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