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TT: Fachverband Tiefe Temperaturen
TT 39: SC: Iron-Based Superconductors - 1111
TT 39.7: Vortrag
Freitag, 26. März 2010, 12:00–12:15, H19
Anomalous Nernst Effect and spin fluctuations in LaFeAsO1−xFx — •Christian Hess, Agnieszka Kondrat, Günter Behr, Rüdiger Klingeler, and Bernd Büchner — Institute for Solid State Research, IFW Dresden, Helmoltzstrasse 20, 01069 Dresden
We present Nernst-effect investigations on LaFeAsO1−xFx. In the parent compound the formation of a SDW state leads to a huge enhancement of the Nernst coefficient at T<TN. Despite the absence of SDW order at underdoped superconducting doping levels, a similar anomalous behavior is also observed (with smaller magnitude), which is suggestive of a spin-fluctuation enhanced Nernst-effect. Interestingly, at optimal doping level the Nernst coefficient is only weakly temperature dependent and appears more conventional.