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Unprecedented current density to high fields in YBa<inf>2</inf>Cu <inf>3</inf>O7-δ superconductor through nano-defects generated by preform optimization in infiltration growth process

Kumar, ND and Rajasekharan, T and Muraleedharan, K and Banerjee, A and Seshubai, V (2010) Unprecedented current density to high fields in YBa<inf>2</inf>Cu <inf>3</inf>O7-δ superconductor through nano-defects generated by preform optimization in infiltration growth process. Superconductor Science and Technology, 23. ISSN 0953-2048

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Abstract

We report record high current densities of 230 kA cm at zero field, and in excess of 10 kA cm up to 7 T at 77 K, in YBa Cu O (Y-123) superconductors fabricated by a modified infiltration growth (IG) process. This was accomplished by optimizing the Y BaCuO (Y-211) preform, into which liquid phases were infiltrated, through a combination of high pressure compaction and limiting the sintering temperature. The optimized sample yielded a Y-123 superconductor with a uniform distribution of fine-grained Y-211. Strong and almost invariant flux pinning observed to high fields up to 7 T, suggest a temperature independent flux pinning mechanism originating from defects in the size range 15-50 nm. Since the present sample has no added grain refiners, nano-sized dopants or mixed rare earths leading to low Tc solid solutions, a unique opportunity presents itself to investigate the cause of the enhanced flux pinning to high fields. We have therefore investigated our samples by transmission electron microscopy, and the studies revealed the presence of domains in the sample with nano-sized defects starting from the domain boundaries, as a possible source of enhanced flux pinning. © 2010 IOP Publishing Ltd. -2 -2 7-δ 2 3 2 5

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:04
Last Modified: 22 Apr 2021 07:21
DOI: 10.1088/0953-2048/23/10/105020