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

• Mechanical and Functional Properties of Materials • Previous Articles     Next Articles

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

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