We report on the flux pinning and optimization of melt-processed ternary (Nd-Eu-Gd)Ba2Cu3O7-δ bulk materials using magnetization and magneto-transport (quasi-flux transformer technique) measurements. The highest flux pinning was observed for the optimal annealing condition, where twin planes act as correlated pinning in the presence of the optimal second-phase addition. The addition of Ag decreases low-field critical current density, whereas high-field behavior does not change drastically. The results were compared with NdBa2Cu3O7-δ single crystals that show various vortex states with increasing defect density. The melt-processed samples demonstrate very similar behavior to the single crystal. The interplay between the point defect and the twin planes resulting an entangled vortex liquid-state remains valid for both single crystals and melt-processed samples.
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