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 Nd_2−xCe_xCuO₄ — •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. Brooks⁴ — ¹Walther-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 Nd_2−xCe_xCuO₄ (NCCO) is rather simple and has a lower critical temperature T_c. 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.