Berlin 2015 – scientific programme
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KR: Fachgruppe Kristallographie
KR 2: Poster Crystallography
KR 2.1: Poster
Monday, March 16, 2015, 19:00–21:00, Poster C
Magnetic properties of high quality single crystals of the electron underdoped cuprate superconductor Nd2−xCexCuO4 — •Alma Dorantes, Cai Qi, Mark Kartsovnik, and Andreas Erb — Walther-Meißner Institut, Walther-Meißnerstraße 8 D-85748 Garching
We present investigations of the magnetic properties of the electron-doped cuprate superconductor Nd2−xCexCuO4 (NCCO) with particular attention to the underdoped regime of the phase diagram. Special attention is given to the region between the antiferromagnetic (AF) and superconducting (SC) state of the electron-doped cuprate superconductors. We tried to investigate whether the AF and SC regions are separated by an intrinsic phase separation or if a microscopic coexistence exists between these two states. Experiments on high quality single crystals were performed to probe the relation between the transition temperature (Tc) and dopant concentration x, and to estimate the superconducting volume fraction. The results indicated that a SC transition can be observed after an appropriate annealing process, even for highly underdoped samples and that bulk superconductivity is present. In addition we find indications of a deviation in the monotonic doping dependence of the transition temperature Tc between samples with 12% and 13% Ce doping, which could signify a first evidence of the so-called 1/8 anomaly in the electron-doped cuprate superconductors.