TEMPERATURE-DEPENDENT MICROSTRUCTURE OF CU3AU IN THE DISORDERED PHASE

We have investigated the temperature dependent fine structure of the e quilibrium diffuse X-ray scattering of a Cu,Au(110) crystal. The diffu se scattering exhibits a marked temperature dependence for the fourfol d peak splitting around the diffuse maxima at the superlattice reflect ion positions associated with Fermi surface imaging. The separation of the split diffuse maxima increases with temperature corresponding to a proliferation of correlated microdomains in a real space picture, In this paper the temperature dependence of the positions of the diffuse peaks is directly related to he temperature- and wavevector-dependent alloy self-energy. At relatively high temperatures this behavior can be described by taking into account first corrections to the Krivoglaz -Clapp-Moss approximation.