Magnetic studies of current conduction and flux pinning in high-T[sub [ital c]] cuprates: Virgin, irradiated, and oxygen deficient materials

Conference · Mon Feb 10 04:00:00 EST 1992 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:5722572

Thompson, J R ^[1]; Sun, Yang Ren; Ossandon, J G ^[2]; Christen, D K; Kerchner, H R; Sales, B C; Chakoumakos, B C ^[3]; Civale, L; Marwick, A D; Holtzberg, F ^[4]

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1. Solid State Division, Oak Ridge National Laboratory, Building 3115, P.O. Box 2008, Oak Ridge, Tennessee 37831-6061 (United States) Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)
2. Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)
3. Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6061 (United States)
4. IBM Watson Research Center, Yorktown Heights, New York 10598-0218 (United States)

To increase the current density and pinning of magnetic flux in high temperature superconductors, defects with point-like and line-like geometries were created in controlled numbers using ion irradiation methods. Single crystals of Y[sub 1]Ba[sub 2]Cu[sub 3]O[sub 7] and Bi[sub 2]Sr[sub 2]Ca[sub 1]Cu[sub 2]O[sub 8] superconductors were studied using dc magnetic methods. These studies showed greatly increased irreversibility in the vortex state magnetization and enhanced intergrain current density [ital J][sub [ital c]] following irradiation. Linear defects, created by irradiation with energetic heavy ions, are particularly effective in pinning vortices at higher temperatures and magnetic fields. Further investigations of flux creep'' (the time dependence of magnetization) are well described by recent vortex glass and collective pinning theories. Complementary investigations have delineated the role of oxygen deficiency [delta] on pinning in aligned Y[sub 1]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] materials.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5722572
• Report Number(s): CONF-920944--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 273:1
• Country of Publication: United States
• Language: English

Related Subjects

665300 -- Interactions Between Beams & Condensed Matter-- (1992-)
665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
CURRENT DENSITY
ELEMENTS
FLUID FLOW
HIGH-TC SUPERCONDUCTORS
ION IMPLANTATION
IRRADIATION
MAGNETIC FLUX
MONOCRYSTALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
RADIATION EFFECTS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VORTEX FLOW
YTTRIUM COMPOUNDS
YTTRIUM OXIDES