Abstract
The type of the magnetic phase transitions in a series of Tb x Ho 1− x Co 2 and Tb x Y 1− x Co 2 compounds is studied by means of magnetization, electrical-resistivity and specific-heat measurements. In both systems the T C values decrease with decreasing Tb content. At about x = 0.7 the type of the magnetic transition changes from second order to first order. An explanation is offered in terms of the Inoue-Shimizu model by taking into account the strong temperature dependence of the magnetic susceptibility of the 3d itinerant electrons.
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