Abstract
Measurements of the static susceptibility and the zero field specific heat of powdered samples of Ln 2ZrS 5 (Ln = rare earth) have been carried out. Gd 2ZrS 5, Tb 2ZrS 5, Dy 2ZrS 5, Er 2ZrS 5 and Sm 2ZrS 5 show an antiferromagnetic ordering at 12.73, 9.27, 5.24, 2.5 and 4.5 K, respectively. The Tb-, Dy- and Er-compound have highly anisotropic magnetic properties which are described with an effective spin S = 1 2 Ising model. In spite of the complexity of the crystal structure, the effective exchange parameter J is derived from the experimental data, making use also of the details of the magnetic structure, which is determined from neutron diffraction experiments. An almost pure spin-spin interaction, projected into the crystal field ground state, may account for the observed phenomena.
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