BULK AND SURFACE ELECTRONIC STATES OF ORDEREDCu3Au(001): AN ANGLE-RESOLVED PHOTOEMISSION INVESTIGATION

S. Löbus, R. Courths, S. Halilov, H. Gollisch and R. Feder
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S. Löbus: Laboratorium für Festkörperphysik, Universität Duisburg, D-47048 Duisburg, Germany
R. Courths: Laboratorium für Festkörperphysik, Universität Duisburg, D-47048 Duisburg, Germany
S. Halilov: Theoretische Festkörperphysik, Universität Duisburg, D-47048 Duisburg, Germany
H. Gollisch: Theoretische Festkörperphysik, Universität Duisburg, D-47048 Duisburg, Germany
R. Feder: Theoretische Festkörperphysik, Universität Duisburg, D-47048 Duisburg, Germany

Surface Review and Letters (SRL), 1996, vol. 03, issue 05n06, 1749-1761

Abstract: We have performed an angle-resolved ultraviolet photoemission spectroscopy (ARUPS) investigation of orderedCu3Au(001)at room temperature using He resonance and synchrotron radiation. The positions of upperCu-like bulk bands near the center Γ of the bulk Brillouin zone (BZ) and the dispersion of the upper sp band along the A line have been determined using bulk-sensitive photon energies10 eV≤hν≥15 eV. Except for a downward shift, the calculated bulk bands are in excellent agreement with experiment. Around the centers$\overline \Gamma$of the surface BZ, we have identified three new surface states in the energy region of the Au-like states and several surface-sensitive features in theCu-like region below the known surface state on top of the Cu-like bulk d bands. These states strongly contribute to the ARUPS spectra forhν≥20 eV. The wealth of surface features found is in overall agreement with a recent surface electronic structure calculation [S. Halilov, H. Gollisch, E. Tamura and R. Feder,J. Phys.: Condens. Matter5, 4711 (1993)]. More detailed information is obtained by comparing the experimental spectra with theoretical ones calculated by a relativistic one-step model formalism.

Keywords: 71.20.Cf; 73.20.At; 79.60.-i (search for similar items in EconPapers)
Date: 1996
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DOI: 10.1142/S0218625X96002680

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