HIGH-RESOLUTION PHOTOEMISSION-STUDY OF HCP-CO(0001)

Using a monochromatized high-flux He discharge lamp, we have investiga ted the electronic bands of hexagonal-closed packed (hcp) Co(0001) nea r the Fermi energy at room temperature. Particularly, sections through the Fermi surface have been measured by high-resolution photoemission using photon energies of 21.2 eV and 40.8 eV. Compared to analogous m easurements from copper and nickel surfaces, the features here are les s sharp, even though LEED patterns indicate a similar degree of surfac e order. Still, an interpretation of these data in terms of calculated Fermi surface contours is possible. The Fermi wave vectors of the min ority d-hole pocket centered at the Gamma-point, are well reproduced. This is furthermore corroborated by polar-angle dependent dispersion m easurements along two high-symmetry azimuths. (C) 1998 Elsevier Scienc e B.V. All rights reserved.