Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Fabrication and Characterization

TT 18.1: Talk

Tuesday, March 24, 2009, 14:00–14:15, HSZ 105

Crystal Growth and Characterization of Ba_1−xK_xFe₂As₂ — •Andreas Erb, Franz Czeschka, Monika Bahurupi, and Rudolf Gross — Walther Meissner Institut für Tieftemperaturforschung, Bayerische Akademie der Wissenschaften, Walther Meissnerstr. 8, 85748 Garching, Germany

We report on the growth and characterization of single crystals of Ba_1−xK_xFe₂As₂ by electrical transport and magnetization measurements. The crystals were grown from high temperature solutions using tin as a flux. Crystals of several mm size in a-b direction can be grown exhibiting sharp superconducting transitions in both resistive and magnetic measurements. We discuss the problem of intrinsic inhomogeneity of the as-grown crystals as a consequence of the phase diagram for this solid solution system. We also outline scenarios for the application of other crystal growth techniques. This work is supported by DFG within the Research Unit 538.