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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.13: Poster

Dienstag, 26. Februar 2008, 14:00–18:00, Poster B

STM investigated characteristics of Pb-Bi2201 in dependence of the lead content — •Olaf Lübben, Lenart Dudy, Alica Krapf, Helmut Dwelk, Christoph Janowitz, and Recardo Manzke — Institut f. Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin

The single layered superconductor Bi_2−yPb_ySr_2−xLa_xCuO_6+δ (x=0.4) around optimal doping has been investigated by scanning tunneling microscopy (STM). Continuously changing the amount of lead showed a fascinating structural development and revealed new modulations in the BiO layer.

Special attention has been given to the “inhomogeneous” background modulation. It is suggested, like in [1], that this background is not just caused by electronic reasons, but has structural origin. Because of the short range of this modulation it could influence the electronic structure of the CuO₂ plane and the charge transfer between this plane and the carrier reservoir (BiO-SrO). In this context the question arises if a “good” and a “bad” background with respect to superconductivity exists.

[1] H. Mashima et al., Phys. Rev. B 73, 060502 (2006).