Observation of proposed flux pinning sites in neutron-irradiated YBa sub 2 Cu sub 3 O sub 7 minus x
- Carnegie Mellon University, Pittsburgh, PA (USA)
- Los Alamos National Laboratory, Los Alamos, NM (USA)
Microstructure and magnetic hysteresis have been compared for two samples of the YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} ({delta}{similar to}0) high-temperature superconductor, one unirradiated, and one irradiated with fast neutrons ({ital E}{gt}0.1 MeV) to a fluence of 3{times}10{sup 18} n/cm{sup 2}. Notable changes in the microstructure include strain-induced contrast from regions 2--7 nm in size. An intrinsic critical current density ({ital J}{sub {ital c}}) of 4.6{times}10{sup 6} A/cm{sup 2} in zero field at 4 K has been determined from magnetic hysteresis measurements for the irradiated sample while 1.2{times}10{sup 6} A/cm{sup 2} is noted for the unirradiated sample. We propose that the observed defect structure in the irradiated material is responsible for increased pinning and consequently higher {ital J}{sub {ital c}}'s.
- OSTI ID:
- 6290040
- Journal Information:
- Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 57:20; ISSN APPLA; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BARYONS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CURRENTS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HIGH-TC SUPERCONDUCTORS
HYSTERESIS
MAGNETIC FLUX
MAGNETIZATION
MICROSTRUCTURE
NEUTRONS
NUCLEONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES