Intrinsic Pinning Property of NaFe2Se2 Superconductor

The intrinsic pinning properties of NaFe2Se2, which is the superconductor with Tc of about 50 K, were studied by the analysis of magnetization curves by the extended critical state model. The NaFe2Se2 sample was prepared by solid-state reaction. The magnetization results by SQUID magnetometer showed the Tc of about 50 K. The temperature dependence of critical current density Jc was estimated.