A-axis high temperature superconducting films with preferential in-plane alignment
US6083884A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1993 |
| Grant date | Jul 4, 2000 |
| Priority date | — |
| Expiry date | Jun 15, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/701
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An a-axis high temperature superconducting film having preferential in-plane orientation is formed. In the preferred embodiment, an a-axis film has substantial amounts of superconductor oriented with its c-axis in a unified direction. YBCO on neodymium gallate (110) plane has resulted in a high temperature superconductor with over 80% by volume being a-axis with c-axis in-plane alignment in one preferential direction. These films are epitaxial. The preferred method of film growth is for in situ growth by laser ablation. Preferably, the a-axis film is nucleated by laser ablation on onto a substrate which is at a temperature of 50 to 100.degree. C. less than the optimal substrate temperature for c-axis growth. Optionally, once a-axis nucleation has begun, the substrate temperature may be increased to optimize superconductor properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.