Magnetic properties of a quasi-two-dimensional Heisenberg antiferromagnetic model

Abstract

On the basis of a two-sublattice approximation of antiferromagnets, it is obtained that ground states of quasi-two-dimensional Heisenberg antiferromagnets on simple cubic lattices are Neel states whose mean staggered spin is equivalent to 0.303-0.422 corresponding to Jperpendicular to /J/sub ///=0-1. The low-temperature mean magnetic moment and Neel temperature are calculated for various Jperpendicular to /J/sub ///. There is no Neel ordering at any non-zero temperature in two-dimensional antiferromagnets. Jperpendicular to is necessary to maintain Neel ordering at finite temperatures.