Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Postersession Superconductivity: Materials - Fabrication and Properties
TT 5.21: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
A check on the checkerboard-like STM patterns of the Bi-cuprates — •Lars Schumachenko, Olaf Lübben, Hendrik Glowatzki, Lenart Dudy, Alica Krapf, Christoph Janowitz, and Recardo Manzke — Humboldt Universität zu Berlin
Topological scanning tunneling microscopy (STM) patterns of the high-temperature superconducting Bi-cuprates are long known to have beside the atomic grid an incoherent background (see, e.g., [1,2]). Measuring the Bi-cuprate Bi2212 at low bias and temperatures below the pseudogap-temperature [3], this background is ordered with a typical periodicity of 4a0 x 4a0 (here a0 is the inplane Cu-O-Cu-length). We will present STM-measurements of the Bi-cuprates La-Bi2201 and Bi2212 and show thereby that at room temperature and relative high bias the background is already ordered. In our interpretation, this ordered background is preferentially caused by the extra Oxygen present in these materials. How these findings would challenge the interpretation of the 4x4 order as the revelation of the hidden checkerboard order [4] will be discussed.
[1] S. H. Pan et al., Nature 413, 282 (2001).
[2] Ø. Fischer et al., Rev. Mod. Phys. 79, 353 (2007).
[3] M. Vershinin et al., Science 303, 1995 (2004).
[4] T. Hanaguri et al., Nature 430, 1001 (2004).