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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.25: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Electronic Transport Properties of LiFeAs and Co doped LiFeAs — •Anne Bachmann, Dirk Bombor, Saicharan Aswaratham, Luminita Harnagea, Sabine Wurmehl, Christian Hess, and Bernd Büchner — Leibnitz Institute for Solid State and Materials Research, IFW Dresden, Germany

Electronic transport properties of the new unconventional superconductor LiFeAs and Co doped LiFeAs have been studied. Unlike in other iron arsenide superconductors this undoped compound exhibits no spin density wave but superconducting properties. Resistivity measurements show this transition at T=17  K. We have studied the magnetoresistance of LiFeAs and extracted the H_c2(T) phase diagram. In contrast to other Fe-As based compounds we find that in LiFe_1−xCo_xAs electron doping suppresses superconductivity.