High Temperature Superconductivity
Abstract
The goals of this program are to develop the technology of Molecular Beam Epitaxial to growth of High Temperature Superconductor material, to optimize the performance of HTSC films with high transition temperatures and critical densities, and to explore the development of electronic devices based on such material. Both fundamental and practical issues are studied which are involved in the heteroepitaxial in-situ growth of copper-containing layered perovskite compounds. This included continued analysis of previously grown films. A significant insight into the MBE growth process was obtained by detailed study of lattice image transmission electron microscopy of one of our earlier as-grown superconducting films of Dy-Ba-Cu-O. In particular, the interplay between kinetic control and the tendency toward thermodynamic equilibrium was evident. This has lead to important insights in understanding the process by which layered, superlattice-like structures in these systems can be grown. The aim is to use kinetic control available in MBE from beam shutters and stable sources to atomically layer the superlattice-like structure of extended unit cell HTSC compounds. Active sources of oxygen are employed to ensure the completion of at least the necessary degree of oxidation and the beams of the constituents are turned on and off using mechanical shutters to layer the constituent species and to provide kinetic control of the growth process.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 09, 1989
- Accession Number
- ADA205013
Entities
People
- James N. Eckstein