Journal of Superconductivity and Novel Magnetism

, Volume 27, Issue 11, pp 2419–2426 | Cite as

Effect of Te Doping on the Structure and Superconductivity of K x Fe2−y Se2−z Te z Single Crystals

  • W. P. Liu
  • M. T. Li
  • C. T. Lin
Original Paper


We report the structure, transport, and magnetic properties of K x Fe2−y Se2−z Te z single crystals grown by optical floating zone technique. The phase separation phenomena were observed in the Te-doped samples. With increasing Te doping level, the c-axis lattice parameter expands for both insulating/semiconducting and superconducting phases while the superconducting transition temperature (T c) decreases and eventually vanishes at z = 0.51. The critical current density was estimated to be 103–104 A/cm2 for the all doped samples. The upper critical field and anisotropic superconducting ratio increase with Te doping. We compared the results of critical current density J c, upper critical field μ 0 H c2 and apparent thermally activated energy U 0 for the samples with z = 0, 0.09, and 0.16. The influence of Te doping on the vortex pinning and the implication of U 0 versus μ 0 H is discussed.


Iron chalcogenide superconductors Te doping effect Critical current density Upper critical field Vortex pinning 



We thank G. Götz for the XRD measurements and C. Busch for the EDX analysis.


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Max Planck Institute for Solid State ResearchStuttgartGermany

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