Applied Physics Letters · 1987 · 123 citations · 10 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSolid State PhysicsThin FilmsAmorphous MaterialsAmorphous SolidsIon ImplantationRadiation Damage In MaterialsSuperconducting MaterialsSuperconducting Thin FilmsAmorphizationAmorphous RegionsAmorphous StructureGrain BoundariesHigh-temperature SuperconductorsIon Beam IrradiationRadiation-induced AmorphizationRadiation-induced Microstructural Evolution
The microstructure of ion-implanted thin films of the superconductor YBa2Cu3Ox has been investigated by transmission electron microscopy. The superconducting properties of the films were dominated by large pancake-shaped grains of YBa2Cu3Ox with their c axis perpendicular to the substrate. Other grains of YBa2Cu3Ox whose c axis was parallel to the substrate formed spherulites. Irradiation with 500 keV O+ ions caused amorphous zones to appear on the grain boundaries between the pancake grains, which initially were free of amorphous or second phases. At higher dose a continuous amorphous layer 150 Å thick was formed. However, the interior of the grains showed no irradiation-induced microstructural features until they became amorphous at a dose of 3×1014 ions/cm2. The appearance of the amorphous layer on the grain boundaries at low doses accounts for the reduction in the superconducting transition temperature observed in these films.
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The effect of radiation upon diffusion in metals
R. Sizmann · Journal of Nuclear Materials · 1978 · 533 citations
Thin superconducting oxide films
R. B. Laibowitz, R. H. Koch, P. Chaudhari et al. · Physical review. B, Condensed matter · 1987 · 286 citations