Suppression of superconductivity and spin-glass behavior in Cu-doped K0.8Fe2Se2

ORAL

Abstract

Single crystals with nominal compositions of K0.8Fe2-xCuxSe2 were grown and studied with low temperature electrical transport and magnetic susceptibility measurements. We show that the superconductivity present in undoped K0.8Fe2Se2 crystals with transition temperature of 31 K is very quickly suppressed with Cu doping into the Fe site, and the system very quickly becomes insulating. We discuss anomalous behavior at higher doping, including spin-glass like behavior with further Cu doping.

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Authors

  • Rongwei Hu

    Center for Nanophysics and Advanced Materials, Dept. of Physics, University of Maryland, College Park, MD 20742, Center for Nanophysics \& Advanced Materials and Department of Physics, University of Maryland

  • Johnpierre Palione

    University of Maryland, Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland-College Park, Center for Nanophysics and Advanced Materials, Dept. of Physics, University of Maryland, College Park, MD 20742, University of Maryland, College Park, Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, Maryland 20742, USA, Center for Nanophysics and Advanced Materials, Physics Dept., University of Maryland, Center for Nanophysics \& Advanced Materials and Department of Physics, University of Maryland

  • Shanta Saha

    Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland-College Park, Center for Nanophysics and Advanced Materials, Dept. of Physics, University of Maryland, College Park, MD 20742, Center for Nanophysics \& Advanced Materials and Department of Physics, University of Maryland

  • Richard Greene

    Center for Nanophysics \& Advanced Materials and Department of Physics, University of Maryland