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Magnetic Properties and Superconductivity in GdFeAsO1−x F x

  • Y. J. Cui
  • Y. L. Chen
  • C. H. Cheng
  • Y. Yang
  • Y. Zhang
  • Y. Zhao
Original Paper

Abstract

Abstract A series of GdFeAsO1−x F x (x=0,0.1, 0.2, and 0.25) samples have been synthesized with conventional solid-state method. The phase purity is significantly improved by using Fe2O3 as the source of oxygen, compared to those prepared using Gd2O3 as the precursor. The lattice parameters are found to shrink with increasing fluorine doping level. The F-doped samples show a superconducting transition with T c increasing with doping level, reaching T c=40.1 K at x=0.25. A pronounced Curie–Weiss-like paramagnetic background, which is usually attributed to the impurity phases, is found to be independent of the fluorine doping level and proven to come from the Gd3+ in the GdFeAsO1−x F x compound with the effective magnetic moment of Gd3+ being μ eff=7.83±0.05 μB. The extrapolated slope of \({dH}_{\mathrm{c2}}/dT|_{T=T_{\mathrm{c}}}\) in this system is about −4.5 T/K.

Keywords

Superconductivity Magnetic properties Fe-based alloys GdFeAsO1−xFx 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Y. J. Cui
    • 1
  • Y. L. Chen
    • 1
  • C. H. Cheng
    • 2
  • Y. Yang
    • 1
  • Y. Zhang
    • 1
  • Y. Zhao
    • 1
    • 2
  1. 1.Key Laboratory of Magnetic Levitation and Maglev Trains (Ministry of Education of China), Superconductivity R&D Center (SRDC), Mail Stop 165#Southwest Jiaotong UniversityChengduChina
  2. 2.School of Materials Science and EngineeringUniversity of New South WalesSydneyAustralia

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