Dresden 2003 – wissenschaftliches Programm
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M: Metallphysik
M 41: Postersitzung
M 41.41: Poster
Donnerstag, 27. März 2003, 14:30–16:30, HSZ
Experimental investigation of the hybridization between Cr and Pt — •D. Zur1, A. Borgschulte1, S. Weber1, P.M. Oppeneer2, and J. Schoenes1 — 1Institut für Halbleiterphysik und Optik, Mendelssohnstr. 3, 38106 Braunschweig — 2Institute of Solid State and Materials Research, P.O. Box 270016, D-01171 Dresden, Germany
The electronic structure of the intermetallic compound CrPt3 is studied by angle-resolved ultraviolet photoemission spectroscopy in the photon energy range of 21-150 eV (BESSY II - U125/1 PGM) on (001) and (111) oriented films grown by molecular-beam-epitaxy. The surface structures and the chemical order are investigated by reflection high-energy electron diffraction (RHEED). The partial density of states of CrPt3 has been estimated using the photoionization dependence of the photoemission. The momentum dependence of the valence-band energies is determined for the Γ-R bulk high-symmetry line and the Γ-M and R-X directions using synchrotron radiation. The nature of these bands was identified by a comparison with band-structure calculations based on density functional theory in the local spin-density approximation and confirms the unusual hybridization of Cr and Pt. Bandmappings of ordered and disordered surfaces show the importance of the local electronic environment of the constituents. To shed light on the coupling mechanism between the atoms of the compound, ultrathin Cr-wedges on Pt-surfaces are investigated by RHEED and photoemission. Using these methods we are able to follow the evolution of the crystalline and electronic structure of the Cr-Pt interface and Cr as function of the film thickness.