Kinematic Effects in Spin-½ Antiferromagnetism

Abstract

A coupled-fermion representation of spin operators is used to examine the effect of the kinematic interaction on the zero-point motion of a spin-½ antiferromagnet. The calculation is carried through fourth order so that exchange corrections are included. It is shown that the kinematic interaction is not small, but that the combined kinematic-dynamic corrections to the spin-wave theory are small, numerical calculations showing a correction of less than 1% of the spin-wave values.