Low-field remanent magnetization in the disordered antiferromagnet Cs2Fe1−xInxCl5·H2O

Abstract Magnetization measurements on single crystals of the site-diluted antiferromagnet A 2 Fe 1− x In x Cl 5 ·H 2 O (A=Cs) were carried out at low magnetic fields ( H ) applied along the easy axis. The data revealed that a remanent magnetization M r develops below the Neel temperature T N . This M r ( T ) is parallel to the easy axis, saturates for H ∼1 Oe and it increases with decreasing T . It has also the same temperature dependence as other diluted systems of the same family (A=K, Rb). For all these systems the normalized M r ( t )/ M r ( t =0.3), where t = T / T N is the reduced temperature, is independent of x and follows a universal curve.