Observation of a true interface state in strained-layer Cu adsorption on Ru(0001).
01 January 1986
Through the first monolayer, Cu adsorbs in a pseudomorphic structure on the Ru(0001) surface with a 5% tensile strain. Angular Resolved Photoemission near the -K point in the surface Brillioun zone reveals a state -1.4eV below the Fermi level which appears localized in the Cu and outermost Ru layers. This state is confirmed by Surface Linearized Augmented Plane Wave calculations to be the anti-bonding partner of a pair of Cu(3d)-Ru(4d) derived interface states.