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TT: Fachverband Tiefe Temperaturen

TT 5: Postersession Superconductivity: Materials - Fabrication and Properties

TT 5.28: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Crystal growth and selected properties of alkali/alkaline earth metal iron arsenides by flux growth and floating zone melting — •Andreea Claudia Budea¹, Igor Morozov², Norman Leps¹, Agnieszka Joanna Kondrat¹, Jorge Enrique Hamann-Borrero¹, Christian Hess¹, Rüdiger Klingeler¹, Günter Behr¹, and Bernd Büchner¹ — ¹IFW Dresden, Dresden, Germany — ²Inorganic Chemistry Department, Moscow State University, Moscow, Russia

Large high quality crystals of various classes of novel alkali/alkaline earth metal-iron arsenides were grown by flux or by high pressure floating zone (FZ) methods. Careful selection and handling of high-purity starting materials and the control of oxygen impurities during the whole preparation process is required. The process parameters crucially depend on solution temperature and the solidification mode of the compound from tin flux. The relatively small partial pressures of arsenic in this class of compounds and the nearly congruent melting behavior enable the melting and crystallization in a high pressure floating zone facility under argon pressures above 40 bar. The characterization and selected physical properties of Li_1−xFeAs, Ba_1−xK_xFe₂As₂, Ba(Fe_1−xCo_x)₂As₂ are reported.