Effect of Lattice Distortions upon the Spin Configuration of Antiferromagnetic YMn_<b>2</b>with C15 Structure

Abstract

By making use of the Luttinger-Tisza method on the classical Heisenberg model, we examine how the isochoric distortions affect the frustrated spin system in YMn 2 with the cubic Laves phase structure. The distance dependece of the exchange parameter is taken into account by perturbational calculation. It is shown that the spin system orders in layered configurations or the YMn 2 type configuration under the influence of tetragonal distortion.