Abstract
Angle-resolved uv photoelectron spectroscopy is the most useful tool for probing the wave-vector k-dependence of the electronic spectral density in metals and alloys. As a result it is a technique which is well suited to investigating the electronic driving force behind phase transitions. In this paper I describe recent results from temperature-dependent studies of the order-disorder transformation in Cu 3Au. Below the transition temperature (≈ 660K) new features associated with the ordered phase appear in the spectra whose strengths increase with decreasing temperature, i.e. the degree of order.
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