Energy transmission and storage.
Thallium superconducting films have high transition temperatures.
Thallium superconducting films having chemical uniformity and smooth surfaces are particularly desirable for high frequency micro-wave conductors operating at high critical current densities. High frequency densities also provide efficient interconnections for high power applications such as energy transmission and storage. This invention provides a method for fabricating thallium-based superconducting thin films having chemical uniformity and smooth surfaces. The method does not use excess thallium from a separate source during post deposition anneal. The method provides repetitive sequential deposition steps of copper, barium, calcium and thallium.