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

The effect of Yb211 doping on the critical transition temperature (Tc), c-lattice parameter, critical current density (Jc), volume pinning force (Fp) 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 Jc(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 Jc performance has the sample with x = 0.05 Yb211 doping ratio. Jc(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.

► The investigation with comparatively were firstly performed between Jc(H), Fp(H) and the levitation force of (Sm123)1−x(Yb211)x samples depending on Yb211 doping ratio.
► We determined that the Jc(0) value at 77 K of (Sm123)1−x(Yb211)x sample is almost five times larger than undoped.
► Optimum of Yb211 doping ratio not only enhances Jc in the low field region but also in the high field region compared with undoped sample.
► The maximum levitation force density increased with increasing of Yb211 doping level (up to x = 0.25) and reheat-temperature.