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TT: Fachverband Tiefe Temperaturen

TT 24: SC: Properties, Electronic Structure, Mechanisms

TT 24.7: Vortrag

Mittwoch, 24. März 2010, 16:00–16:15, H19

Angle-dependent interlayer magnetoresistance in the normal state of the electron-doped cuprate Nd_1−xCe_xCuO₄ — •Toni Helm¹, Mark Kartsovnik¹, Pavel Grigoriev², Michael Lambacher¹, Andreas Erb¹, Ilya Sheikin³, and Rudolf Gross¹ — ¹Walther-Meissner-Institit, Bayerische Akademie der Wissenschaften, Garching, Germany — ²L.D. Landau Institute for Theoretical Physics, Russian Ac. Sci., Chernogolovka, Russia — ³Grenoble High Magnetic Field Laboratory, Grenoble, France

We report on systematic studies of the normal-state c-axis magnetoresistance of high quality single crystals of Nd_2−xCe_xCuO₄ as a function of magnetic field orientation, performed for a broad range of Ce concentrations. In underdoped compounds, the major effect of magnetic field comes from coupling to spins in a magnetically ordered system. Notably, the spin-dependent magnetotransport prevails even for superconducting compositions, up to the optimal doping level. In the overdoped regime, the conventional orbital coupling of charge carriers to a magnetic field becomes dominant. Most interestingly, overdoped samples exhibit features characteristic of the so-called angle-dependent magnetoresistance oscillations (AMRO). We analyze the data using the semiclassical kinetic model and discuss the results in terms of the geometry of the Fermi surface responsible for the AMRO.

The work was supported by the DFG via Research Unit 538 and EuroMagNET II under the EU contract.