Fabrication and characterization of SmO0.7F0.2FeAs bulk with a transition temperature of 56.5 K
journal contributionposted on 2012-05-27, 00:00 authored by Zhiyong Liu, Lin Ma, Junjing Zhao, Binjie Yan, Hongli Suo
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 = 20ΔM/[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 SmO0.7F0.2FeAs was a superconductor with a very promising application.
This work is financially supported by the National Basic Research Program of China (No. 2006CB601005), the National High Technology Research and Development Program of China (No. 2009AA032401), the National Natural Science Foundation of China (Nos. 50771003 and 50802004), the Beijing Municipal Natural Science Foundation (No. 2092006), and the Program for New Century Excellent Talents in University of Ministry of Education of China (No. 39009001201002).
Publisher StatementThis is a copy of an article published in the journal Rare Metals © The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2011. The original publication is available at www.springerlink.com. DOI: 10.1007/s12598-011-0418-y