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TT: Fachverband Tiefe Temperaturen

TT 27: SC: Fe-based Superconductors - LiFeAs

TT 27.2: Talk

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

Influence of doping on the physical properties of LiFeAs — •Luminita Harnagea¹, Claudia Nacke¹, Igor Morozov^1,2, Dirk Bombor¹, Anne Bachmann¹, Uwe Gräfe¹, Yannic Utz¹, Mahmoud Abdel-Hafiez¹, Seung-Ho Baek¹, Ulrike Stockert^1,3, Rüdiger Klingeler^1,4, Anja U.B. Wolter¹, Hans-Joachim Grafe¹, Christian Hess¹, Sabine Wurmehl¹, and Bernd Büchner¹ — ¹Institute for Solid State Research, IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — ²Moscow State University, Moscow 119991, Russia — ³MPI for Chemical Physics of Solids, D-01187 Dresden, Germany — ⁴Kirchhoff Institute for Physics, Heidelberg University, D-69120 Heidelberg, Germany

Single crystals of LiFe_1−xM_xAs (M = Cr, Rh, Ni) were grown using the self-flux method. The parent compound LiFeAs is an unconventional superconductor with a transition temperature of about 17 K. Upon doping on the Fe site with Rh, Ni or Cr the superconductivity is suppressed, which is reflected in different physical properties. This observation is in contrast to the effect of doping in the NaFeAs homologous and in other Fe-based superconductor families, where the superconductivity is induced or/and stabilized by replacing Fe either by Rh or Ni.