J. Mater. Sci. Technol. ›› 2011, Vol. 27 ›› Issue (3): 227-232.

• Reviews • 上一篇    下一篇

Study of preparation and superconducting properties of F-doped SmO1-xFxFeAs

liuzhiyong   

  1. 北京工业大学
  • 收稿日期:2010-04-30 修回日期:2010-08-08 出版日期:2011-03-28 发布日期:2011-03-21
  • 通讯作者: liuzhiyong
  • 基金资助:

    国家973项目;国家863项目;the National Nature Science Foundation of China;北京市自然科学基金

Preparation and Superconducting Properties of F-doped SmO1-xFxFeAs

Zhiyong Liu, Hongli Suo, Lin Ma, Min Liu, Zhiping Wu, Zhichao Guo, Luping Han, Meiling Zhou   

  1. Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China
  • Received:2010-04-30 Revised:2010-08-08 Online:2011-03-28 Published:2011-03-21
  • Contact: Hongli Suo
  • Supported by:

    the National Basic Research Program 973 of China;National High Technology Research and Development Program 863 of China;the financial support from the National Nature Science Foundation of China;Beijing Municipal Natural Science Foundation

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摘要： Abstract Here we report the fabrication and superconductivity of the iron-based arsenic oxide SmO1-xFxFeAs compound. XRD results prove that the lattice parameters a and c decrease systematically with increasing x in between 0＜x≤0.35, but when x＞0.35 the a and c increasing with the decrease of x in the SmO1-xFxFeAs. The Tc increases with increasing x in between 0＜x≤0.3, while x＞0.3 the Tc decreasing with the increase of x. It was found that at x=0.3 SmO0.7F0.3FeAs has the highest onset resistivity transition temperature at 55.5K. The Jc value at 10 K for the as-obtained SmO0.7F0.3FeAs is 1.3×105A/cm2 (0T). Meanwhile one can estimates Hc2(0) from the slope of the Hc2(T) curve at T=Tc , and for the 90%ρn criterion (Tc=55K), Hc2(0) is determined to be ~253T.

Abstract: Here we report the fabrication and superconductivity of the iron-based arsenic oxide SmO1-xFxFeAs compound. X-ray diffraction (XRD) results prove that the lattice parameters a and c decrease systematically with increasing x in between 0<x≤0.35, but when x>0.35 the a and c increase with the decrease of x in
the SmO1-xFxFeAs. The critical temperature (Tc) increases with increasing x in between 0.15≤x≤0.3, while x>0.3 the Tc decreases with the increase of x. It is found that at x=0.3 SmO0.7F0.3FeAs has the highest onset resistivity transition temperature of 55.5 K. The critical current density (Jc) value at 10 K for the obtained SmO0.7F0.3FeAs is 1.3×105 A/cm2 (0 T). Meanwhile one can estimates Hc2(0) from the slope of the Hc2(T) curve at T=Tc (HC2 is the upper critical field), and for the 90% normal-state resistivity (ρn) criterion (Tc=55 K), Hc2(0) is determined to be ~253 T.

Key words: SmO1-xFxFeAs compound, F-doped, Superconductivity