Superconducting Thin Films for Cellular Applications

外延TlBaCaCuO （TBCCO）和YBa2Cu3O7-8 （YBCO）薄膜的制备已经在少量衬底上得到证实。目前，LaAlO3是惰性的，最大限度地减少了衬底和超导体之间的相互扩散，并且与高温超导结构具有良好的晶格匹配。然而，它的大规模使用也有局限性。两个最重要的问题是高介电常数（23.5）和孪生。短期内最有希望的替代基板是MgO，它没有这些问题；然而，在这种衬底上生长高质量的TBCCO薄膜是困难的。此外，对于YBCO，超导体的质量相对于LaAlO3上的YBCO有所下降。由于MgO与超导体之间的热膨胀匹配，在第二阶段将使用MgO作为衬底。

9402117 Eddy, Michael The preparation of epitaxial TlBaCaCuO (TBCCO) and YBa2Cu3O7-8 (YBCO) films has been demonstrated on a small number of substrates. At present, LaAlO3 is inert, minimizing interdiffusion between the substrate and superconductor and has a good lattice match to the HTS structure. However, there are limitations to its wide-scale use. The two most significant problems are the high dielectric constant (23.5) and twinning. The most promising near-term alternative substrate which does not have these problems is MgO; however, growth of high quality TBCCO films on this substrate is difficult. In addition, for YBCO, the quality of the superconductor is degraded relative to YBCO on LaAlO3. MgO will be used as the substrate in Phase II because of the thermal expansion match between MgO and the superconductor.