Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity: Cuprate High-Temperature Superconductors 2

TT 30.2: Vortrag

Mittwoch, 25. März 2009, 14:15–14:30, HSZ 304

Normal State Magnetotransport Properties of high quality Nd_2−xCe_xCuO₄ single crystals — •Michael Lambacher, Toni Helm, Wolfgang Prestel, Mark Kartsovnik, Andreas Erb, and Rudolf Gross — Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meißner-Str. 8, 85748 Garching, Germany

We present normal state magnetotransport data taken on a series of high quality Nd_2−xCe_xCuO₄ single crystals grown by the TSFZ (traveling solvent floating zone) technique. We show that the unusual transport data of the optimally doped and overdoped crystals can be well explained within a two-band model using standard Boltzmann transport theory and anisotropic scattering rates. In particular, the observed sign change of the Hall effect with varying temperature is nicely reproduced. The presented model deviates from the general picture of the Fermi surface (FS) topology and doping dependent FS reconstruction deduced from ARPES measurements. This work has been supported by the DFG within the research unit FOR 538