Abstract
We investigated the structural and magnetic properties of Cu 2 Mn 1-x Fe x Al (x = 0.25, 0.5, 0.75) alloys. Among the three compositions, only x = 0.25 composition crystallizes in single phase with L2 1 structure but its magnetic response indicates a complex magnetic structure. The magnetic isotherms were fitted to modified Langevin equation which indicates the presence of clusters with large magnetic moment. The ac susceptibility studies showed the presence of a superparamagnetic phase in the system over and above ferromagnetic order. To determine the nature of the interactions among the clusters, the variation of freezing temperature (T f ) with applied ac frequency was analyzed using different models (Neel-Arrhenius, Vogel-Fulcher, and critical slowing down model).
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