Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity: Cuprate High-Temperature Superconductors 2

TT 30.3: Vortrag

Mittwoch, 25. März 2009, 14:30–14:45, HSZ 304

Revealing the Fermi surface of Nd_2−xCe_xCuO₄ by high-field magnetotransport — Toni Helm¹, •Mark Kartsovnik¹, Marek Bartkowiak², Michael Lambacher¹, Nikolaj Bittner¹, Ilya Sheikin³, Andreas Erb¹, and Rudolf Gross¹ — ¹Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Hochfeld-Magnetlabor Dresden, Germany — ³High Magnetic Field Laboratory, Grenoble, France

Knowing the exact Fermi surface and its evolution with the doping level is one of the vitally important issues in the field of high-T_c superconducting cuprates. A promising tool to explore the Fermi surface is high-field magnetotransport which has been widely employed in studies of other layered systems, such as organic conductors. Recently, a breakthrough in the Fermiology of hole-doped cuprates was made by the observation of angular magnetoresistance oscillations (AMRO) and magnetic quantum oscillations. For electron-doped cuprates, however, no high-field magnetotransport data related to their Fermi surface has been reported so far. Here, we present results of high-field studies of the interlayer magnetoresistance of high-quality electron-doped Nd_2−xCe_xCuO₄ single crystals. Samples with doping levels x=0.13 to 0.17 have been studied at different temperatures and field orientations. We compare our data with those obtained on hole-doped cuprates and discuss them in terms of the Fermi surface geometry and its doping dependence.

This work is supported by DFG via Research Unit 538.