email@example.com (Duncan Elliott) (01/03/90)
Electrical Engineering Computer Group Cider Seminar Series Fabrication and Characterization of High-Temperature Superconductor Thin Films by David Chin Department of Electrical Engineering UC Berkeley Time: Friday, Jan. 5, 1990, 12:05 --- Place: GB 220 Superconductive electronic systems made of high-temperature superconducting materials would combine the advantages of high operating speed, low power dissipation, and relatively low refrigeration costs. High-temperature superconductive thin films are essential to a high-temperature superconductive system. Being able to fabricate those thin films with high quality is the first step of a long journey towards high-temperature superconductive systems. We are routinely depositing high-quality in-situ high-Tc YBaCuO thin films by RF magnetron sputtering from a single stoichiometric target using an off-axis configuration. The as-deposited films on MgO and SrTiO3 substrates are superconducting with Tc(R=0) greater than 83 K. The critical current density of the films exceed 106 A/cm2. The films have been characterized by various analytical techniques. Rutherford backscattering spectra show that the compositions of the films are close to that of the target. An ion channeling experiment shows that films on MgO substrates are highly epitaxial. We have determined from X-ray spectra and transmission electron micrographs that the films are highly crystallized with the c-axis of the orthorhombic crystal perpendicular to the surface to the films. In this talk, the deposition process and analytical techniques of the high-quality superconductor thin films will be discussed. Coming Soon Date Who Topic Jan. 19 Pierre Delisle A Load Balancing Facility for Distributed Systems -- Note that the Cider Seminar Series has been moved to Galbraith 220 for the spring term.