Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.23: Poster

Monday, March 14, 2011, 14:00–18:00, P4

⁷⁵As NMR Study of Iron Pnictides RFeAsO_1−xF_x — •Marc Lux¹, Damian Rybicki¹, Thomas Meißner¹, Jürgen Haase¹, Grant Williams², and Chong Shen² — ¹Faculty of Physics and Earth Science, Leipzig University, Linnéstraße 5, 04103 Leipzig, Germany — ²The MacDiarmid Institute, Industrial Research, P.O. Box 31310, Lower Hutt 5040, New Zealand

Since the recent discovery of superconductivity in iron pnictides they continuously attract an enormous amount of attention. Nuclear magnetic resonance (NMR) is a perfect tool to study their local properties through measurements of Knight shifts and relaxation rates. We present a ⁷⁵As NMR study of the RFeAsO_1−xF_x family. We show temperature dependence of Knight shift, spin-spin and spin-lattice relaxation rates as a function of fluorine doping and orientation of the crystal structure with respect to the external magnetic field. The results are discussed and compared to other families of iron pnictides.