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Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 15: Superconductivity - Properties, Electronic Structure, Order Parameter I

TT 15.5: Talk

Saturday, March 5, 2005, 15:00–15:15, TU H2053

Determination of the hole density of (Bi,Pb)2(Sr,La)2CuO6+δ superconductors — •L. Lasogga1, R. Mitdank1, A. Krapf1, H. Dwelk1, S. Rogaschewski1, C. Janowitz1, R. Manzke1, K. Scheurell2, and I. Murwani21Humboldt University Berlin, Department of Physics, Newtonstrasse 15, 12489 Berlin — 2Humboldt University Berlin, Department of Chemistry, Brook-Taylor-Strasse 2, 12489 Berlin

The hole concentration of the CuO2 planes of Bi2−yPbySr2−xLaxCuO6+δ cuprates has been investigated in great detail by two techniques, x-ray absorption spectroscopy (XAS) at the CuL3 edge and iodometric titration. The XAS measurements were performed at the BESSY II beamline PM3. Our investigations include both ceramics and single crystals containing no lead (y = 0) and larger amounts of lead (y = 0,16 ... 0,45). For each case we studied series of variable content of lanthanum (x = 0,0 ... 0,8). Finally we compare ceramics and single crystals, discuss the dependence between hole density, critical temperature and content of lead and lanthanum. Moreover we show the dependence of the x-ray absorption from the angle of incidence.

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