Berlin 2005 – scientific programme
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O: Oberflächenphysik
O 11: Elektronische Struktur I
O 11.5: Talk
Friday, March 4, 2005, 16:45–17:00, TU EB420
Electronic Structure of decagonal Al-Cu-Co quasicrystals — •Jan Hugo Dil1, JeongWon Kim1, Eli Rotenberg2, Karsten Horn1, and Wolfgang Theis3 — 1Fritz-Haber-Institut der MPG, Berlin — 2Advanced Light Source, Lawrence Berkeley Lab — 3Fachbereich Physik der FU Berlin
An analysis of the electronic structure of quasicrystals is important for an explanation of the unusual structural and physical properties of these materials. Progress has been made in understanding the band structure in the lower s-p region of the valence levels in decagonal quasicrystalline alloys. However, an identification of the dispersion relation of bands near the Fermi level in these solids, which lack translational symmetry, is still missing. Here we characterize the electronic levels in decagonal Al-Cu-Co through photoemission data from the tenfold and twofold symmetric surfaces. Al-Cu-Co is a useful material from the point of view of photoemission experiments since the Cu and Co d bands are well separated, and the influence of either d metal can thus be identified. We compare strongly dispersing features in the region near EF with LEED data to identify those reciprocal lattice vectors which give rise to dominant features in the photoemission intensity maps, and compare our data with results from Al-Ni-Co where the Ni and Co bands overlap.