Comparative study of critical current density, pinning force and levitation force behavior in Yb211 doped-Sm123 bulk superconductors

Abstract

The effect of Yb211 doping on the critical transition temperature (T c), c-lattice parameter, critical current density (J c), volume pinning force (F p) and the vertical levitation force density properties of MPMG-processed (Sm123) 1-x(Yb211) x samples were investigated. In this study the (Sm123) 1-x(Yb211) x sample with x = 0.25 shows the best J c(0) value which is almost five times larger than that of the undoped one at zero field and at 77 K, though in the peak effect region the best J c performance has the sample with x = 0.05 Yb211 doping ratio. J c(H) curves exhibits a wide plateau ranging from 0.75 to 2.75 T at 77 K with Yb211 doping ratio for 0.05 ? x ?0.20 pointing out that the (Sm123) 1-x(Yb211) x samples presented here are attractive for superconducting application especially under high magnetic fields. © 2011 Elsevier B.V. All rights reserved.