Abstract
We report the first spin-resolved photoemission study of the electronic structure of Cu 3 Au(001) using circularly polarised synchrotron radiation in the energy range 9-30 eV. In particular, this unique technique was applied to study the spin-orbit splitting of electronic bands in Cu 3 Au, the interpretation of which is still a controversy. We have identified the symmetry characters of the initial states in the Au region (i.e. between 4–7 eV binding energy). Near the X-point, we find the splitting between Au-like bands of Δ 5 7 and Δ 5 6 symmetry to be about 0.8 eV. This value is in agreement with recent calculations [J W Davenport, R E Watson and M Weinert, Phys Rev, B37 , 9985 (1988)]. The experimental value of spin-orbit splitting of 0.2 eV in the Cu region is more than in pure Cu, indicating at least some hybridisation with the Au states.
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