Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 52: Elektronische Struktur IV

O 52.2: Vortrag

Mittwoch, 9. März 2005, 11:00–11:15, TU EB301

Quasi-one-dimensional surface states on Pt(110) — •Mariana Minca, Enrico Dona, Zhenrong Zhang, Alexander Menzel, and Erminald Bertel — Phys. Chemie, Univ. Innsbruck, A-6020 Innsbruck

Experimental investigation of the electron correlation responsible for the rich and technologically highly interesting phase diagram [1] of low-dimensional or even quasi-one-dimensional (Q1D) materials is difficult on account of the complex structure, surface reconstructions, and sensitivity to radiation damage of most model systems. Here we show that the clean missing-row reconstructed (1x2) Pt(110) surface can be used as a Q1D model system. The electron dispersion as measured by ARUPS at different photon energies reveals a Tamm-type Q1D surface resonance [2], which is derived from the very high bulk-DOS between the L and W point in the volume band structure [3]. Upon increasing the temperature, the corresponding quasiparticle peak at the Fermi Energy decays rapidly, as is seen in other weakly coupled Q1D systems. We discuss the unusual temperature dependence in terms of a coherent-incoherent transition.

Support by the Austrian Science Fund (FWF) is gratefully acknowledged.

[1] M. Imada, A. Fujimori, and Y. Tokura, Rev. Mod. Phys. 70, 1039 (1998).

[2] S.D. Kevan (Ed.), Angle-Resolved Photoemission (Elsevier, Amsterdam 1992), p.99

[3] O.K. Andersen, Phys. Rev. B 2, 883 (1970).