Münster 1999 – wissenschaftliches Programm
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O: Oberflächenphysik
O 40: Elektronische Struktur (Experiment und Theorie) (IV)
O 40.1: Vortrag
Freitag, 26. März 1999, 11:15–11:30, S1
Electronic States and Magnetism of 1-D Monatomic Wires — •A. Dallmeyer1, C. Carbone1, W. Eberhardt1, C. Pampuch2, O. Rader2, W. Gudat2, P. Gambardella3, and K. Kern3 — 1Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich — 2BESSY, Lentzealle 100, D-14195 Berlin — 3Institut de Physique Expérimentale, EPF-Lausanne, CH-1015 Lausanne
The electronic structure and the magnetic behaviour of a material can be deeply modified by reducing its dimensions along one or more directions in space. STM and thermal He-scattering show that 1-D nano-structures consisting of monatomic (Xe, Kr, Ag, Cu, Co) chains can be grown by step-edge decoration of a vicinal Pt(997) surface [1].
The electronic structure of monatomic Cu- and Co-wires has been investigated by angle-resolved photoemission with synchrotron radiation. Sensitivity to the small amount (≈ 0.1 ML) of deposited material that forms the 1-D wires could be achieved at the photon energy of the Pt-5d Cooper minimum, where the photoemission cross section of the substrate is strongly reduced. A single photoemission feature is associated to the 3d-emission from the Cu-monatomic wire. A double-peaked 3d-structure is instead observed for Co wires, suggesting the presence of a 1-D exchange-split band and of local magnetic moments. By increasing the coverage an evolution of the electronic states follows as the deposited material develops a 2-D and a 3-D character.
[1] V. Marsico, M. Blanc, K. Kuhnke, K. Kern; PRL, Vol. 78 (1), Jan. (1997)