Regensburg 2010 – wissenschaftliches Programm
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 Nd1−xCexCuO4 — •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 Nd2−xCexCuO4 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.