caa a22 4500 445383208 CHVBK 20180317143023.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10948-010-1123-z doi (NATIONALLICENCE)springer-10.1007/s10948-010-1123-z Single Crystal Growth and Effect of Doping on Structural, Transport and Magnetic Properties of A1− x K x Fe2As2 (A [Elektronische Daten] Ba, Sr) [G. Sun, D. Sun, M. Konuma, P. Popovich, A. Boris, J. Peng, K.-Y. Choi, P. Lemmens, C. Lin] We demonstrate the preparation of large, free-standing iron pnictide single crystals with a size up to 20×10×1mm3 using solvents in zirconia crucibles under argon atmosphere. Transport and magnetic properties have been investigated to study the effect of potassium doping on the structural and superconducting property of the compounds. The spin density wave (SDW) anomaly at T s ∼138K in BaFe2As2 single crystals from self-flux shifts to T s ∼85K due to Sn solvent growth. We show evidence for an incorporation of Sn on the Fe site. The electrical resistivity data show a sharp superconducting transition temperature T c ∼38.5K for a single crystal of Ba0.68K0.32Fe2As2. Anearly 100% shielding fraction and the bulk nature of the superconductivity for the single crystal are confirmed by magnetic susceptibility data. A sharp transition T c ∼25K occurs for the single crystal of Sr0.85K0.15Fe2As2. There is direct evidence for a coexistence of the SDW and superconductivity in the low doping regime of Sr1−x K x Fe2As2 single crystals. Structural implications of the doping effects as well as the coexistence of the two order parameters are discussed. Springer Science+Business Media, LLC, 2010 Crystal structure nationallicence Single crystal growth nationallicence Asenate nationallicence Magnetic materials nationallicence Sun G. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut Sun D. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut Konuma M. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut Popovich P. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut Boris A. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut Peng J. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut Choi K.-Y Department of Physics, Chung-Ang University, 221 Huksuk-Dong, Dongjak-Gu, 156-756, Seoul, Republic of Korea aut Lemmens P. Institute for Condensed Matter Physics, TU Braunschweig, Mendelssohnstr. 3, 38106, Braunschweig, Germany aut Lin C. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1773-1785 1557-1939 24:5<1773 2011 24 10948 https://doi.org/10.1007/s10948-010-1123-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-1123-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sun G. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut NATIONALLICENCE 700 1- Sun D. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut NATIONALLICENCE 700 1- Konuma M. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut NATIONALLICENCE 700 1- Popovich P. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut NATIONALLICENCE 700 1- Boris A. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut NATIONALLICENCE 700 1- Peng J. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut NATIONALLICENCE 700 1- Choi K.-Y Department of Physics, Chung-Ang University, 221 Huksuk-Dong, Dongjak-Gu, 156-756, Seoul, Republic of Korea aut NATIONALLICENCE 700 1- Lemmens P. Institute for Condensed Matter Physics, TU Braunschweig, Mendelssohnstr. 3, 38106, Braunschweig, Germany aut NATIONALLICENCE 700 1- Lin C. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569, Stuttgart, Germany aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1773-1785 1557-1939 24:5<1773 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer