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Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: SC: Fe-based Superconductors - LiFeAs

TT 27.3: Vortrag

Dienstag, 15. März 2011, 14:30–14:45, HSZ 304

Suppressed superconductivity in charge doped Li(Fe1−xCox)As single crystals — •Saicharan Aswartham1, Günter Behr1, Luminita Harnagea1, Dirk Bombor1, Igor V. Morozov1,2, Anne Bachmann1, Christian Hess1, Sabine Wurmehl1, and Bernd Büchner11Leibniz Institute for Solid State and Materials Research, D 01069 Dresden, Germany — 2Moscow State University, Moscow 119991, Russia

Single crystals of the new unconventional superconductor LiFe1−xCoxAs 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 LiFe1−xCoxAs.

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