Irradiation-induced enhancement of the critical current density of epitaxial YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ thin films
Thin films of YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ have been prepared epitaxially on <100> SrTiO/sub 3/ by laser evaporation in a single-step process. The resistivity of the films decreases linearly with temperature and is measured to 80 ..mu cap omega.. cm at 100 K. The samples are completely superconducting at 88 K. The critical current densities are as high as 5 x 10/sup 6/ A/cm/sup 2/ at 77 K in strip lines of 8 ..mu..m width. Irradiation with 25 MeV /sup 16/O ions at 77 K combined with in situ measurements was applied to study the influence of lattice disorder on superconducting properties. The resistivity rho increases, whereas the critical superconducting temperature T/sub c//sub 0/ and the critical current density j/sub c/ in the absence of a magnetic field decrease proportionally to the ion fluence. Contrary to this behavior, we observe an enhancement of j/sub c/ in magnetic fields larger than 1 T. The maximum enhancement is about a factor of 2 at a fluence of 10/sup 14/ /sup 16/O/cm/sup 2/. This increase is due to pinning at irradiation-induced pinning centers. Simultaneously the upper critical magnetic field B/sub c//sub 2/ (T) exhibits an increasing positive curvature leading to a crossover with B/sub c//sub 2/(T) of the unirradiated samples.
- Research Organization:
- Siemens AG, Forschungslabor, P. O. Box 3220, 8520 Erlangen, Federal Republic of Germany, and Physikalisches Institut II, Universitaet Erlangen, 8520 Erlangen, Federal Republic of Germany
- OSTI ID:
- 6358878
- Journal Information:
- Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 54:11; ISSN APPLA
- Country of Publication:
- United States
- Language:
- English
Similar Records
The effect of the neutron irradiation on the critical current and the microstructure of the melt-textured growth YBa sub 2 Cu sub 3 O sub y
Ion beam controllable modification of YBa sub 2 Cu sub 3 O sub 7 minus x superconducting thin films
Related Subjects
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360206* -- Ceramics
Cermets
& Refractories-- Radiation Effects
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHARGED PARTICLES
COATINGS
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRITICAL FIELD
CURRENT DENSITY
CURRENTS
DATA
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ENERGY RANGE
EPITAXY
EVAPORATION
EXPERIMENTAL DATA
FILMS
INFORMATION
IONS
LASER RADIATION
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC FLUX
MEV RANGE
MEV RANGE 01-10
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
OXYGEN IONS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
THIN FILMS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VACUUM EVAPORATION
VAPOR DEPOSITED COATINGS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES