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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.21: Poster

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

A method to contact individual microcrystalline oxypnictide single crystals — •Andreas Teichgräber, Christian Hess, Sabine Wurmehl, and Bernd Büchner — IFW Dresden

Despite the rapid general progress in fabricating large high-quality single crystals of pnictide superconductors, the controlled synthesis of 1111-type iron pnictide sample remains up to now possible only in the form of polycrystalline samples or tiny single crystals. This work describes a method to prepare electronic contacts on individual micrometer sized pnictide single crystals (extracted from a polycrystalline pellet of 1111-type iron pnictide samples). The micro-crystals were embedded in epoxy resin and subsequently contacted electrically using electron beam lithography. First test measurements demonstrate the applicability of the method which thus opens a new route to systematically investigate the electronic transport of 1111-type iron pnictide superconductors on individual single crystals over a wide range of compositions and doping levels.