Tunneling Microscopy of Superconductors and Tunneling Barriers
Abstract
Thin films of high temperature superconductors were made by sputtering and by co-evaporation. The former method produced thin films of YBaCuO which were completely superconducting at 82 K with 6 K transition widths. A new method was developed at the University of Texas which produced films of YBaCuO on strontium titanate that were superconducting at 84 K. This method minimizes the process temperature and produces films which are superconducting without the need for annealing. The films were also grown on silicon and sapphire substrates with zero resistance of 68 K or better. A low temperature scanning tunneling microscope was used to study the superconducting properties of these and other samples. High quality spectroscopic data was obtained which yields a value of approximately 11 for the ratio of the superconducting gap to the transition temperature.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 1988
- Accession Number
- ADA197686
Entities
People
- Alex De Lozanne
Organizations
- University of Texas at Austin