Classical treatment of a heisenberg linear chain with spin alternation; application to the MnNi(EDTA)-6H2O complex

Abstract

The thermodynamic behaviour of an exchange-coupled linear system with two alternating spin sublattices is investigated from a classical point of view. A closed formula is derived for the magnetic susceptibility which is easily adapted to real spin systems, using appropriate scaling transformations. The proposed approach is shown to describe successfully the behaviour of a new bimetallic chain complex MnNi(EDTA)-6H2O. In particular, a minimum in the xT versus T plot is observed at very low temperature, in agreement with theory. © 1983.