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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 20: SC: Fabrication and Characterization of Iron-Based and Other Superconductors

TT 20.6: Talk

Wednesday, March 24, 2010, 10:45–11:00, H19

Crystal growth and physical characterization of Ba(Fe1−xCox)2As2 — •C. Nacke1, G. Behr1, S. Singh1, N. Leps1, G. Friemel1, U. Stockert1, H.H. Klauss2, S. Wurmehl1, C. Hess1, R. Klingeler1, and B. Büchner11Leibnitz Institute for Solid State and Material Research (IFW) Dresden, Germany — 2TU Dresden, Institute for Solid State Physics, Germany

The vertical Bridgman technique was used to grow mm-size crystals of the BaFe2As2 compound and its Co-doped superconducting variants. With this technique the crystals were grown directly from a stoichiometric melt with the composition Ba(Fe1−xCox)2As2. The resulting crystals were platelet-like and have lateral sizes up to 10 x 10 mm2 and a thickness up to 1 mm. Analysis by X-ray diffraction and EDX confirm the correct Ba-122-phase. Measurements of magnetic susceptibility and electrical resistivity reveal superconducting properties of the Co-doped crystals. The suceptibility plots for the 10% Co-doping samples (x=0.1) show a sharp transition to superconductivity at Tc=23 K. This data are in good agreement with those from the resistivity. In particular, the zero-field µSR data show a pure Gaussian relaxation and confirm very high sample purity.

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