Magnetization and AC susceptibility measurements have been carried out to investigate the magnetic phase transition of Gd1-xDYxCo2 compounds. It is revealed that the type of the magnetic phase transition changes from second order to first order around x(c) = 0.8 with the increase of Dy concentration. A satisfactory explanation is offered in terms of the Inoue-Shimizu model. The exchange-enhanced susceptibility of the compounds within the exchange-enhanced paramagnetism model is in good agreement with the 3d-electrons susceptibility deduced by Inoue-Shimizu model. (C) 2003 Elsevier Science B.V. All rights reserved.
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