Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.13: Poster

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

Single-Crystal Growth of Sr_1−xK_xFe₂As₂ superconductors using Sn flux — •Devang Joshi, Anna Böhmer, Frederic Hardy, Peter Adelmann, Doris Ernst, Thomas Wolf, Rainer Fromknecht, Peter Schweiss, and Christoph Meingast — Institute für Festkörperphysik, Karlsruher Institute für Technologie, 76021 Karlsruhe, Germany

Single crystals of Sr_1−xK_xFe₂As₂ were grown by a high-temperature solution growth method using Sn flux. Stochiometric amounts of FeAs, Sr, K and Sn (1:20) were put in alumina crucibles, which were then sealed in iron crucibles under argon atmosphere. The iron crucibles were further sealed in evacuated quartz tubes. The total assembly was then heated to 900 ^∘C followed by slow cooling to 450 ^∘C in roughly 15 days. The single crystals were separated from the Sn flux using a centrifuge, and the K-contents of the single crystals were determined using EDAX. The spin-density-wave and superconducting transitions in these crystals were further characterized using magnetic SQUID, high-resolution thermal expansion and specific heat measurements.