Abstract
We recently developed a cation-exchange process and using it obtained high-quality epitaxial Hg-based high-temperature superconducting films. Unlike the conventional thermal-reaction process that needs to comply with the stringent requirements of chemical phase equilibrium, cation exchange was found to be a simple kinetic process that can be carried out in a large processing window based on the principle of atomic perturbation. Since this process can be carried out in a large processing window of the Hg-vapor partial pressure, we further developed a batch process for scaling up Hg-HTS tapes in long length and a crucible technique for scaling up to large area.
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