Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – Superconductor next to layer containing nonsuperconducting...
Patent
1993-06-15
2000-07-04
King, Roy V.
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
Superconductor next to layer containing nonsuperconducting...
505701, 428930, B32B 900, H01L 3900
Patent
active
060838841
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.
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Sun Jonathan Zan-Hong
Young Kwo-Hsiung
King Roy V.
Superconductor Technologies Inc.
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