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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 27: Superconductivity: Cuprate Superconductors

TT 27.1: Talk

Wednesday, March 28, 2012, 11:30–11:45, H 2053

Quantum and classical magnetoresistance oscillations in the electron-doped cuprate superconductor Nd2−xCexCuO4 — •Toni Helm1, Mark V. Kartsovnik1, Nikolaj Bittner1, Andreas Erb1, Rudolph Gross1, Carsten Putzke2, Erik Kampert2, Frederik Wolff-Fabris2, Iliya Sheikin3, Stephan Lepault3, Cyril Proust3, Andhika Kiswandhi4, Eun San Choi4, and James S. Brooks41Walther-Meissner-Institute, Garching, Germany — 2Dresden High Magnetic Field Laboratory, Dresden-Rossendorf, Germany — 3Laboratoire National des Champs Magnétiques Intenses, Grenoble, France — 4National High Magnetic Field Laboratory, Tallahassee, USA

The fundamentals of high-temperature superconductivity have not been understood completely, yet. Compared to most of the hole-doped cuprates, the electron-doped compound Nd2−xCexCuO4 (NCCO) is rather simple and has a lower critical temperature Tc. By applying sufficiently high magnetic fields superconductivity is suppressed and the normal-conducting state can be accessed for even lowest temperatures. In pulsed and steady field experiments we observed Shubnikov-de Haas (SdH) and angle-dependent magnetoresistance oscillations (AMRO) for a series of NCCO single crystals in the range of x = 0.14−0.17. Starting from optimal doping up to the higher edge of the superconducting region our results provided clear evidence for the existence of a translational symmetry breaking. Here we report on how it develops towards the underdoped side and give an explanation for the AMRO arising only for overdoped samples in very high fields.

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