Applied Physics Letters · 1995 · 22 citations · 0 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSolid State PhysicsThin FilmsHigh-temperature MaterialsSuperconducting MaterialsSuperconducting Thin FilmsThin Film AnnealingThin Film Electrical PropertiesAnnealingAnnealing EffectsAnnealing Temperature EffectsCritical Current DensityCritical TemperatureCurrent DensitySuperconducting Critical TemperatureSuperconducting Properties
The superconducting properties of TlBa2CaCu2O7+δ(Tl-1212) films are greatly enhanced by annealing in unreactive ambients such as nitrogen at temperatures ranging from Ta=250–600 °C. The transition temperature, Tc, of these Tl-1212 films as-grown in oxygen is 70 K. Annealing for 1 h at 250 °C elevates Tc above 90 K. Tc further increases and sharpens for Ta=600 °C. In addition, subtle changes occur in the microstructure correlating with improved critical current density. These results indicate that Tl-1212 films may be of greater relevance for electronics applications than previously believed.