2008/06/19 by Zhaoshun Gao, Lei Wang, Yanpeng Qi +5 · 1 citation
Materials Science · Physics and Astronomy · #Critical current #Critical field #Diffraction #Field (mathematics) #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Magnetization #Phase (matter) #Physics of Superconductivity and Magnetism #Superconductivity #Transition temperature #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/21/11/112001
published as Supercond. Sci. Technol. 21 (2008) 112001 · 14 pages, 6 figures
arxiv created 2008/06/19 · openalex publication_date 2008/09/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We demonstrate that Ta sheathed SmO1-xFxFeAs wires were successfully fabricated by the powder-in-tube (PIT) method for the first time. Structural analysis by mean of x-ray diffraction shows that the main phase of SmO1-xFxFeAs was obtained by this synthesis method. The transition temperature of the SmO0.65F0.35FeAs wires was confirmed to be as high as 52 K. Based on magnetization measurements, it is found that a globe current can flow on macroscopic sample dimensions with Jc of ~3.9x103 A/cm2 at 5 K and self field, while a high Jc about 2x105 A/cm2 is observed within the grains, suggesting that a significant improvement in the globle Jc is possible. It should be noted that the Jc exhibits a very weak field dependence behavior. Furthermore, the upper critical fields (Hc2) determined according to the Werthamer-Helfand-Hohenberg formula are (T= 0 K) = 120 T, indicating a very encouraging application of the new superconductors.