Spin and Hole Dynamics in Doped Anisotropic Heisenberg Antiferromagnets

Abstract

Though the nature and physical origin of the antiferromagnetism observed in the layered perovskites remain unsettled questions, it is widely accepted that most of the action occurs in the Cu-O layers characteristic of all the compounds having a superconducting phase. The observation of long ranged two dimensional antiferromagnetic correlations far beyond the Néel temperature T _N support this view.¹ This way, the Cu-O layers are of special interest because likely provide a good realization of a low-dimensional spin-1/2 Heisenberg antiferromagnet. Although the ability of the two dimensional Heisenberg model to fully explain the magnetic properties of the layered metal oxides has not been established,^2,3 its study has became one of the most active fields of research in solid state physics.^2–7