Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 5: Postersession Superconductivity: Materials - Fabrication and Properties

TT 5.27: Poster

Monday, March 23, 2009, 13:00–16:45, P1A

The Superconducting Phase Diagram of Ba_1−xK_xFeAs Single Crystals — •M. Bartkowiak¹, G.L. Sun², C.T. Lin², B. Keimer², and J. Wosnitza¹ — ¹Hochfeld-Magnetlabor Dresden (HLD), Forschungszentrum Dresden-Rossendorf, Postfach 510119, 01314 Dresden — ²Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart

The discovery of superconductivity in iron pnictides has opened up a new class of high-T_c superconductors. It is quite remarkable that superconductivity is induced in layers of FeAs. These layers are separated by either rare-earth oxides or barium, which when doped act as charge-carrier reservoir. Single crystals of the (122) phase are currently available. We have determined the temperature dependence of the critical field H_c2, for various single crystals of K-doped BaFe₂As₂ using ac-transport measurements.

The experiments were done at the pulsed-field facility in Dresden in fields up to 60 T applied parallel and perpendicular to the superconducting planes. The obtained phase diagram serves as an excellent benchmark for theoretical models of the order parameter.