Low-field remanent magnetization in the disordered antiferromagnet Cs 2Fe 1− xIn xCl 5·H 2O

Abstract

Magnetization measurements on single crystals of the site-diluted antiferromagnet A 2Fe 1− x In x Cl 5·H 2O (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 Néel 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.