| 摘要 |
<p>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.</p> |
