Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Superconductivity - Poster Session
TT 8.9: Poster
Montag, 26. März 2007, 14:00–17:45, Poster A
X-ray absorption spectroscopy study of hole doping on Pb-Bi2201 single crystals — •ahmad kamal ariffin, beate müller, rüdiger mitdank, lenart dudy, helmut dwelk, alica krapf, christoph janowitz, and recardo manzke — Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin
X-ray absorption spectroscopy is a reliable technique to evaluate the hole content nH in polycrystalline oxide-based high temperature superconductors. For single crystals, the same method can be used by taking into consideration the dependency of the absorption on orientation of the polarization vector in the CuO2-plane. The polarization i.e. angular dependence of the main and satellite peak at the Cu-L3 edge of Bi2−y Pby Sr2−x Lax CuO6+δ (Pb-Bi2201) single crystals was studied by XAS over a wide doping range. The optimum and the underdoped samples show maxima and minima corresponding to the high symmetry lines of the Brillouin zone. The hole content nH can be determined as angular average. However, in the hole overdoped sample, the peak ratio does not reflect nH directly. This will be discussed in the context of data on polycrystalline materials [1].
[1] M. Schneider et al., Phys. Rev. B 72, 014504 (2005)