Fabrication and characterization of SmOo.7F0.2FeAs bulk with a transition temperature of 56.5 K

稀有金属（英文版）, 2011, 30(5): 496-500. doi: 10.1007/s12598-011-0418-y

^1, , ^2, , ^3, , ^4, , ^5,

1.College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

2.College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

3.Department of Physics, University of Illinois at Chicago, Chicago, IL 60607, America;Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, America

4.College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

5.College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

Fabrication and characterization of SmOo.7F0.2FeAs bulk with a transition temperature of 56.5 K

LIU Zhiyong ^1, , MA Lin ^2, , ZHAO Junjing ^3, , YAN Binjie ^4, , SUO Hongli ^5,

1.College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

2.College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

3.Department of Physics, University of Illinois at Chicago, Chicago, IL 60607, America;Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, America

4.College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

5.College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

Keywords： iron-based superconductor

The superconductivity of iron-based superconductor SmO0.7F0.2FeAs was investigated.The SmO0.7F0.2FeAs sample was prepared by the two-step solid-state reaction method.The onset resistivity transition temperature is as high as 56.5 K.X-ray diffraction (XRD) results show that the lattice parameters a and c are 0.39261 and 0.84751 nm,respectively.Furthermore,the global Jc was more than 2.3 × 105 A/cm2 at T=10 K and H =9 T,which was calculated by the formula of Jc=20AM/[a(1 - a/(3b))].The upper critical fields,Hc2≈ 256 T (T=0 K),was determined according to the Werthamer-Helfand-Hohenberg formula,indicating that the SmO0.7Fo.2FeAs was a superconductor with a very promising application.

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Fabrication and characterization of SmOo.7F0.2FeAs bulk with a transition temperature of 56.5 K

参考文献