Photoemission from the ordered and disordered (100) surface of Cu 3Au

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.