Electronic properties of a pseudomorphic Cu-layer on Ni 111/

The band structure of a monolayer Cu on Ni 111.was studied both by angle resolved UV photoemission spectroscopy ARUPS.and density functional DF.calculations. The Cu 3d-bands at binding energies between 2 eV and 5 eV show a very pronounced k dispersion along thew112xandw110xsubstrate directions, but no dispersion with k . This proves the 5 H two-dimensional character of the Cu 3d-bands. The periodicity of the bands coincides with the periodicity of the Ni 111. surface. The experimentally determined two-dimensional band structure of the pseudomorphic Cu monolayer on Ni 111.is in very good agreement with the results of DF calculations on the system. From this comparison we obtain detailed information about the CurNi interaction and the k-dependent coupling of Cu and Ni bands. q1999 Elsevier Science B.V. All rights reserved.