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- W1996769345 abstract "Thin films of YBa2Cu3O7−x have been prepared epitaxially on 〈100〉 SrTiO3 by laser evaporation in a single-step process. The resistivity of the films decreases linearly with temperature and is measured to 80 μΩ cm at 100 K. The samples are completely superconducting at 88 K. The critical current densities are as high as 5×106 A/cm2 at 77 K in strip lines of 8 μm width. Irradiation with 25 MeV 16O ions at 77 K combined with in situ measurements was applied to study the influence of lattice disorder on superconducting properties. The resistivity ρ increases, whereas the critical superconducting temperature Tc0 and the critical current density jc in the absence of a magnetic field decrease proportionally to the ion fluence. Contrary to this behavior, we observe an enhancement of jc in magnetic fields larger than 1 T. The maximum enhancement is about a factor of 2 at a fluence of 1014 16O/cm2. This increase is due to pinning at irradiation-induced pinning centers. Simultaneously the upper critical magnetic field Bc2 (T) exhibits an increasing positive curvature leading to a crossover with Bc2(T) of the unirradiated samples." @default.
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- W1996769345 date "1989-03-13" @default.
- W1996769345 modified "2023-10-18" @default.
- W1996769345 title "Irradiation‐induced enhancement of the critical current density of epitaxial YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−<i>x</i></sub>thin films" @default.
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- W1996769345 doi "https://doi.org/10.1063/1.101423" @default.
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