A thermodynamical analysis of second-order magnetic transitions in commensurate and incommensurate magnetic systems within a mean-field theory is presented. New and original results are obtained concerning the specific heat of amplitude-modulated magnetic structures; especially the specific-heat discontinuity at the ordering temperature T N is reduced by a factor of 2/3 with regard to that expected in ferro- or helimagnetic structures. In addition, under certain conditions, the maximum of specific heat at T N is shifted to a temperature below T N . Recent experimental data on GdCu 2 Si 2 and GdNi 2 Si 2 compounds support quite well these peculiarities.
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Blanco et al. (1991) studied this question.
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