The doped anisotropic antifferromagnet, which is believed to describe the elementary properties of the high temperature superconductors, is studied by making use of Green's function theory of the t-J model. The Néel transition and staggered magnetization dependence on the anisotropic parameter and the doping density δ in La2-δSrδCuO4 are obtained. These results are found to be in good agreement with experiments on the cuprates.
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