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Rare earth (RE - Ce, Gd) modified Nd<inf>1-x</inf>RE<inf>x</inf>FeAsO<inf>0.7</inf>F<inf>0.3</inf> superconductor with enhanced magneto-transport properties

Aswathy, PM and Anooja, JB and Varghese, N and Chandrakanth, CK and Devendra Kumar, N and Sundaresan, A and Syamaprasad, U (2015) Rare earth (RE - Ce, Gd) modified Nd<inf>1-x</inf>RE<inf>x</inf>FeAsO<inf>0.7</inf>F<inf>0.3</inf> superconductor with enhanced magneto-transport properties. RSC Advances, 5. pp. 41484-41492.

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Abstract

© The Royal Society of Chemistry. 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).

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:19
Last Modified: 21 Nov 2017 03:33
DOI: