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Aswathy, P. M; Anooja, J. B; Varghese, Neson; Chandrakanth, C. K; Devendra Kumar, N; Sundaresan, A; Syamaprasad, U
RSC advances, 05/2015, Letnik: 5, Številka: 52Journal Article
The influence of rare earth (RE - Ce, Gd) doping at the Nd site in the NdFeAsO 0.7 F 0.3 superconductor wherein Ce and Gd have ionic radii in the order Ce > Nd > Gd is investigated. The structural and superconductivity characterization of the pure and doped samples show that Ce doping enhances the T C of Nd 1− x RE x FeAsO 0.7 F 0.3 to a maximum of 53.6 K at x = 0.1 while Gd doping attains a T C of 55.1 K at x = 0.15. Interestingly, both Ce and Gd doping create neither secondary phases nor precipitates within the detection limit of XRD. However, the lattice defects due to Ce and Gd doping modifies NdFeAsO 0.7 F 0.3 and assists in pinning the flux lines on these defects thereby exhibiting an enhanced J C ( H ) performance especially at high fields. It is also observed that the relatively small ionic size of Gd is more effective in T C enhancement, while the lattice defects due to larger ionic size of Ce favor the remarkable enhancement of J C ( H ). The influence of rare earth (RE - Ce, Gd) doping at the Nd site in the NdFeAsO 0.7 F 0.3 superconductor wherein Ce and Gd have ionic radii in the order Ce > Nd > Gd is investigated.
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