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Dresden, Germany

Aswartham S.,Institute for Solid Research | Nacke C.,Institute for Solid Research | Friemel G.,Institute for Solid Research | Leps N.,Institute for Solid Research | And 9 more authors.
Journal of Crystal Growth | Year: 2011

We have employed the high temperature solutions growth technique and the Bridgman technique to grow cm-size high-quality single crystals of pristine BaFe2As2 (Ba122) and its Co-doped superconducting variants. In the first approach, self-flux (Fe, Co)As was used to achieve a homogeneous melt of composition Ba(Fe, Co)3.1As3.1 at T=1463 K. The melt was then cooled slowly under a temperature gradient in a double-wall crucible assembly to obtain large and flux-free single crystals of Ba(Fe, Co)2As2. In the second approach, single crystals were grown directly from a stoichiometric Ba(Fe, Co)2As2 melt at T=1723 K employing the Bridgman technique associated with a vertical tube furnace. Using both techniques single crystals with lateral dimensions up to 25×10 mm2 and thickness up to 1 mm were obtained. Details of the two methods are given and a comparative study of the magnetic and transport properties of the single crystals obtained using the two methods is presented. © 2010 Elsevier B.V. All rights reserved. Source

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