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 20.5: Talk

Wednesday, March 24, 2010, 10:30–10:45, H19

Single-crystal growth and characterization of ferro-pnictides A(Fe,Co,Ni)₂As₂ (A = Ba, Sr) and (A_1−xK_x)Fe₂As₂(A = Ba, Eu) — •S. Aswartham, S. Singh, G. Behr, N. Leps, G. Friemel, U. Stockert, S. Wurmehl, R. Klingeler, C. Hess, and B. Büchner — IFW Dresden, Helmholtzstraße 20, D-01069 Dresden, Germany

We employed a modified Bridgman and self-flux methods to grow single crystals of A(Fe, Co, Ni)₂As₂ (A = Ba, Sr) and (A_1−xK_x)Fe₂As₂(A = Ba, Eu) series, respectively. Using these techniques large single-crystals with dimensions up to 25 x 10 mm² and thickness up to 1 mm were grown. Susceptibility and resistivity of these crystals were studied. Narrow superconducting transition widths (≈ 0.5 K) and large residual resistivity ratios (≈ 7) indicate the high-quality of our single crystals. Here we present details of our crystal growth methods, structural characterizations and physical properties.