Abstract
The excitations of the diluted anisotropic Heisenberg antiferromagnet are studied using the coherent potential approximation by extending previous work for the isotropic case. The excitations of the system are described in terms of an effective medium, which is self-consistently determined using the CPA condition to treat the scattering of a vacancy and its shell of neighbours coherently. The results of calculations for the density of states and for the spectral weight function are presented using values of the parameters appropriate to the system (Co1-xZnx)F2. Preliminary comparison with neutron scattering data is made and a brief discussion is given of analytical difficulties in this and other similar approximation schemes.
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