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Influence of rare earth doping on the structural and electro-magnetic properties of SmFeAsO<inf>0.7</inf>F<inf>0.3</inf> iron pnictide

Anooja, JB and Aswathy, PM and Varghese, N and Chandrakanth, CK and Devendra Kumar, N and Sundaresan, A and Syamaprasad, U (2015) Influence of rare earth doping on the structural and electro-magnetic properties of SmFeAsO<inf>0.7</inf>F<inf>0.3</inf> iron pnictide. Inorganic Chemistry Frontiers, 2. pp. 731-740. ISSN 2052-1545

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Abstract

This journal is © the Partner Organisations. The effects of rare earth site doping on the structural, superconducting and magnetic properties of SmFeAsO < inf > 0.7 < /inf > F < inf > 0.3 < /inf > iron pnictide are investigated. Gd < sup > 3+ < /sup > and Ce < sup > 3+ < /sup > ions are chosen by virtue of their position being on either side of Sm < sup > 3+ < /sup > . Doping of both smaller (Gd < sup > 3+ < /sup > ) and larger (Ce < sup > 3+ < /sup > ) ions at the Sm < sup > 3+ < /sup > site increases the T < inf > C < /inf > up to 55 K. Doping with the smaller Gd < sup > 3+ < /sup > results in lattice contraction and thereby enhances T < inf > C < /inf > . It is interesting to observe that though Ce < sup > 3+ < /sup > doping in SmFeAsO < inf > 0.7 < /inf > F < inf > 0.3 < /inf > exhibits an increase in lattice parameters, a substantial enhancement of T < inf > C < /inf > occurs. The enhancement in T < inf > C < /inf > due to increased charge carrier concentration is also confirmed using Hall Effect measurement. Apart from T < inf > C < /inf > enhancement, the simultaneous doping of both at oxygen and rare earth sites prominently increases the superconducting properties such as J < inf > C < /inf > , H < inf > C1 < /inf > and H < inf > C2 < /inf > . The co-doped samples also exhibit better magnetic field dependence of J < inf > C < /inf > over the entire field of study. It is also observed that the Ce < sup > 3+ < /sup > doped sample shows higher J < inf > C < /inf > in the high field region due to its enhanced flux pinning properties.

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: