H - Electricity – 01 – L
Patent
H - Electricity
01
L
H01L 39/24 (2006.01) C30B 23/02 (2006.01) C30B 33/02 (2006.01)
Patent
CA 2111210
2111210 9222426 PCTABS00018 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 (12) oriented with its c-axis in a unified direction parallel to the substrate (16). YBCO on neodium gallate (110) plane has resulted in a high temperature superconductor with over 80 % by volume being a-axis with in-plane orientation. These films are epitaxial. The preferred method of film growth is for in situ growth by a laser ablation. Preferably, the a-axis film is nucleated by laser ablation onto a substrate which is at a temperature of 50 to 100 ·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.
Sun Jonathan Zan-Hong
Young Kwo-Hsiung
Smart & Biggar
Superconductor Technologies Inc.
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