Regensburg 2002 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 17: Postersitzung II: Mesoskopische Systeme (1-19), Supraleiter: Theorie (20-26), Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter (27-33), Schwere Fermionen, Kondo-Systeme (34-45)
TT 17.33: Poster
Mittwoch, 13. März 2002, 14:30–18:00, A
High-resolution photoemission of n=1 and n=3 Bismuth-HTSC single crystals — •L. Dudy1, C. Janowitz1, R.-S. Unger1, R. Müller1, J. Zeggel1, A. Krapf1, H. Dwelk1, H. Höchst2, and R. Manzke1 — 1Humboldt-Universität zu Berlin, Institut fr Physik, Invalidenstr. 110, 10115 Berlin — 2Synchrotron Radiation Center (SRC), University of Wisconsin
We concentrate our photoemission investigations on the single-layer material Bi2Sr2−xLaxCuO6+δ (Bi-2201) with one CuO2-plane per unit cell, and triple-layer material Bi2Sr2Ca2Cu3O10+δ (Bi-2223). From both superconductors we are able to grow high-quality single crystals, whereas for the single-layer material the hole concentration in the CuO2-planes can be varied almost continuously from overdoping to the underdoping regime. In this contribution we present high-resolution photoemission results of the fine structure in the spectral function near the Fermi energy achieved on optimally doped Bi-2201. By polarization dependent photoemission a band splitting, not observed previously, could be extracted. With the experimental conditions at SRC we were able to measure the split bands directly in k-space along the ΓM direction near the M-point. In the context of different microscopic mechanisms proposed for high-Tc superconductivity, the observation of two bands along one direction in Bi-2201 points to correlated non-Fermi-liquid-like one-dimensional behaviour in the electronic structure of the two-dimensional CuO2-planes.