over-doped on the fabrication and superconductivity of the SmO1-xFδFeAs compound
We report the fluorin doped on the fabrication and superconductivity of the iron-based arsenic oxide SmO1-xFヤFeAs(ヤ∶x) compound. The fluorin over-doped can greatly reduce the heat treatment temperature and the heat treatment time, meanwhile the superconductivity of the SmO1-xFxFeAs samples did not reduce and even be certainly improved. The onset resistivity transition temperature(Tc) is as high as 56.5K in the SmO0.7F0.3FeAs sample prepared by the two-step solid state reaction method at 1150∩ for 40h, the Jc of the sample is 2.3】105A/cm2 (10K、0T). The Tc of the fluorin over-doped SmO0.7F0.35FeAs and SmO0.7F0.4FeAs samples prepared by the two-step solid state reaction method at 1100∩ for 20 hours are 56K and 55K, the Jc of the both samples are 1.9】105A/cm2 and 1.7】105A/cm2 (10K、0T), respectively. XRD results prove that the lattice parameters a and c decrease systematically with increasing x between 0＜x÷0.3, when x＞ 0.3, the lattice parameters a and c increase with the decreasing of x in the SmO1-xFxFeAs. But the lattice parameters a and c are even decreased with modest increasing of ヤ in the SmO1-xFヤFeAs(ヤ∶x) compound, the a and c are a=3.9233A、c=8.4768 A a=3.9251A、c=8.4774Ain the SmO0.7F0.35FeAs and SmO0.7F0.4FeAs samples. It was account that the decrease of the lattice parameters result in increasing of Tc.
Iron-based superconductor SmO1-xFxFeAs doped Tc
ZhiYong Liu HongLi Suo Lin Ma Min Liu Junjing Zhao Ziping Wu Zhichao Guo MeiLing Zhou
College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan,Chaoy Department of Physics, University of Illinois at Chicago, Chicago, IL 60607 Materials Science Divisi
国内会议
长沙
英文
1-11
2010-06-19（万方平台首次上网日期，不代表论文的发表时间）