Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 10: Superconductivity - Properties, Electronic Structure, Order Parameter

TT 10.10: Vortrag

Dienstag, 27. März 2007, 12:00–12:15, H18

STM local strucuture analysis of Pb-Bi2201 depending on the lead content — •Olaf Lübben, Ralf-Peter Blum, Lenart Dudy, Alica Krapf, Helmut Dwelk, Christoph Janowitz, and Recardo Manzke — Institut f. Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin

With scanning tunneling microscopy (STM) we have performed a detailed and systematic structural analysis of optimally lanthanum doped single-layered bismuth cuprates, Bi_2−yPb_ySr_2−xLa_xCuO_6+δ (x=0.4), as a function of the Pb content. As expected, the periodicity of the well-known (5×1) superstructure varies with increasing the amount of Pb. For about y=0.4 the superstructure is almost suppressed but, unexpectedly, new modulations occur in the electron density which might influence the electronic properties of these cuprates. In addition, this could affect the charge transfer between the carrier reservoir (BiO-SrO) and the CuO₂ plane as suggested for Pb-Bi2212 by Shi et al.[1].

[1] L. Shi et al., J. Phys.: Condens. Matter 13, 5195 (2001)