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), Vol. 54:11
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
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PHYSICAL RADIATION EFFECTS
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CRITICAL CURRENT
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CURRENT DENSITY
ELECTRIC CONDUCTIVITY
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ELECTROMAGNETIC RADIATION
ENERGY RANGE
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NUMERICAL DATA
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