Weak link behavior in polycrystalline BaPb sub 0. 75 Bi sub 0. 25 O sub 3

Conference · Wed Mar 01 04:00:00 EST 1989 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA)

OSTI ID:7199952

Cooley, L; Daeumling, M ^[1]; Willis, T C; Larbalestier, D C ^[2]

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1. Wisconsin Univ., Madison, WI (USA). Applied Superconductivity Center
2. Wisconsin Univ., Madison, WI (USA). Dept. of Metallurgical and Mineral Engineering

The authors have studied the critical current densities of polycrystalline samples of the perovskite oxide superconductors BaPb{sub 0.75}Bi{sub 0.25}O{sub 3} (BPB). BPB does not have the complications of twin boundaries and a highly anisotropic unit cell as is found in the high T{sub c} oxide superconductors (HTSC), and the coherence length (0) is much longer than HTSC materials (approximately 7 nm as compared to approximately 0.5 to 2.5 nm). Thus some problems which have proven quite complex for HTSC materials (e.g. twin pinning or weak links) should be absent or have a different character in BPB. The authors have produced several samples of BPB. X-ray diffraction showed that the samples were single phase, but an electron microprobe was used to identify about 1 vol.% of other phases present. They found that the transport critical current density, as high as 2 A/cm{sup 2} in zero field, drops markedly in fields of only 0.1 T, a result also found in YBa{sub 2}Cu{sub 3}O{sub 7} where it is attributed to the presence of weak links. Flux penetration measurements place the magnetization critical current density at about 10{sup 4}A/cm{sup 2}.

• OSTI ID: 7199952
• Report Number(s): CONF-880812--
• Conference Information: Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA) Journal Volume: 25:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
426001* -- Engineering-- Superconducting Devices & Circuits-- (1990-)
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL STRUCTURE
CRYSTALS
CURRENT DENSITY
CURRENTS
DATA
DIFFRACTION
DISLOCATION PINNING
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
GRAIN BOUNDARIES
HIGH TEMPERATURE
INFORMATION
JUNCTIONS
LEAD COMPOUNDS
LEAD OXIDES
MAGNETIC FLUX
MATERIALS
MATRIX MATERIALS
MICROSTRUCTURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
POLYCRYSTALS
SCATTERING
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
THEORETICAL DATA
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES