Magnetic susceptibilities of the compounds AFeCl3(A=Tl,Rb,NH4,Cs) with antiferromagnetic linear chains

Abstract
The magnetic susceptibilities of the compounds AFeCl 3 ( A = Tl,Rb,NH 4 , Cs ) were investigated in the temperature region 2–250°K. The results are interpreted in terms of an antiferromagnetic linear‐chain model. The values of the effective anisotropic intrachain exchange interaction are calculated. The exchange interaction depends on the distance between neighboring Fe2+ions in the chains.