Superconducting Electronic Film Structures.
Abstract
Bulk samples of the newly discovered La-Sr-Cu-O Superconductors have been made which have critical onset temperatures over 38 K. The greater effectiveness of impurities (oxygen) compared to epitaxy for the stabilization of stoichiometric A15 Nb-Ge was demonstrated. The positive effect of oxides on the formation of A15 Nb-A1 was also shown. Experiments involving the deliberate addition of a contaminant (methane) during barrier deposition provided a major advance in the understanding of the processes required for producing high quality NbN-MgO-NbN junctions. A model for predicting the orientation of single crystal Nb and Nb-Sn films on sapphire was experimentally verified. Results were obtained which indicate that epitaxy is essential for NbN-Mg)-NbN trilayer processing if the junction is to be operated above 4.2 K.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 20, 1987
- Accession Number
- ADA179134
Entities
People
- A. I. Braginski
- J. R. Gavaler