Nonsuperconducting Micron Size Particle as Effective Pinning Centre for Enhanced J{sub c} in High-T{sub c} Superconductors

Journal Article · Thu Oct 23 00:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3027183· OSTI ID:21251606

Roul, B K ^[1]

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1. Institute of Material Science, Planetarium Building, Bhubaneswar-751013, Orissa (India)

Understanding the real mechanism responsible for achieving high transport critical current density (J{sub c}) in the high temperature (high-T{sub c}) cuprate superconductors has been one of the primary goal. The only promising way is to tailor the high-Tc cuprate material during preparation stage incorporating suitable non-superconducting particles within superconducting matrix, which are known to serve as effective pining centers. Incorporation of non-superconducting particle like silver with dimension down to micron/submicron size in the superconducting matrix is very stable and form a homogenous solid solution matrix, which has got the better stability on aging and found to be effective in enhancing flux pining in high-Tc superconducting system. In this paper, studies have been made to investigate and review the effect of non-superconducting micron size Ag particle in to the matrix of RE-Ba-Cu-O (RE = Sm, Gd and Y) 123 high-Tc ceramic superconducting system. XRD, SEM, magnetization, magnetotransport and microwave induce DC voltage measurements were carried out to study the effect of Ag into 123-superconducting system. It is observed that controlled addition of Ag into Sm-Ba-Cu-O (SBCO), Gd-Ba-Cu-O (GBCO) and Y-Ba-Cu-O (YBCO) ceramic superconductor do not react with the decomposed phases but remains in the metallic form. This brings about a lowering of the normal-state resistivity. The increase of magnetic critical current density (Jmc), transport critical current density (Jtc), and, hence pinning force density (Fp) with Ag addition into above three systems suggest the creation of an SNS-type proximity junction at the intergranular region and stronger Josephson current paths between the superconducting intergrains. This is attributed to the physical densification and consequent reduction of the total number of weak links by Ag addition into the above mentioned ceramic superconducting system.

• OSTI ID: 21251606
• Journal Information: AIP Conference Proceedings, Vol. 1063, Issue 1; Conference: IWMNMM-2008: International workshop on mesoscopic, nanoscopic and macroscopic materials, Bhubaneswar (India), 2-4 Jan 2008; Other Information: DOI: 10.1063/1.3027183; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
BARIUM OXIDES
CERAMICS
COPPER OXIDES
CRITICAL CURRENT
CUPRATES
CURRENT DENSITY
ELECTRIC POTENTIAL
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
MAGNETIZATION
MICROWAVE RADIATION
PARTICLES
SCANNING ELECTRON MICROSCOPY
SILVER
SOLID SOLUTIONS
SUPERCONDUCTIVITY
X-RAY DETECTION
X-RAY DIFFRACTION
YTTRIUM OXIDES