Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 27: SC: Fe-based Superconductors - LiFeAs

TT 27.3: Talk

Tuesday, March 15, 2011, 14:30–14:45, HSZ 304

Suppressed superconductivity in charge doped Li(Fe_1−xCo_x)As single crystals — •Saicharan Aswartham¹, Günter Behr¹, Luminita Harnagea¹, Dirk Bombor¹, Igor V. Morozov^1,2, Anne Bachmann¹, Christian Hess¹, Sabine Wurmehl¹, and Bernd Büchner¹ — ¹Leibniz Institute for Solid State and Materials Research, D 01069 Dresden, Germany — ²Moscow State University, Moscow 119991, Russia

Single crystals of the new unconventional superconductor LiFe_1−xCo_xAs with x =0, 0.025, 0.05 were grown by a new approach using the self-flux technique. Superconducting properties have been studied by means of temperature dependent resistivity and magnetic susceptibility. The superconducting transition temperature was found to decrease upon Co-doping at the Fe site. Charge doping in LiFeAs supresses superconductivity, in contrast to the effects of charge doping in other Fe-As compounds, where charge doping supresses the spin density wave and establishes superconductivity. We present crystal growth and superconducting properties of LiFe_1−xCo_xAs.