Low-field remanent magnetization in the disordered antiferromagnet Cs2Fe1-xInxCl5 center dot H2O

Magnetization measurements on single crystals of the site-diluted antiferro magnet A(2)Fe(1-x)In(x)Cl(5).H2O (A = Cs) were carried out at low magnetic fields (H) applied along the easy axis. The data revealed that a remanent m agnetization M-r develops below the Neel temperature T-N. This M-r (T) is p arallel to the easy axis, saturates for H similar to 1 Oe and it increases with decreasing T. It has also the same temperature dependence as other dil uted systems of the same family (A = K, Rb). For all these systems the norm alized 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. (C) 2001 Elsevier Science B .V. All rights reserved.