新型纳米掺杂多层钆钡铜氧超导薄膜制备和磁通钉扎机理研究

项目名称： 新型纳米掺杂多层钆钡铜氧超导薄膜制备和磁通钉扎机理研究

项目编号： No.11204174

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 刘林飞

作者单位： 上海交通大学

项目金额： 25万元

中文摘要： 尽管超导技术成功了，但关于超导仍有许多不明白。是时候协同研究工艺、薄膜缺陷和磁通钉扎之间的相互关系。因为超导带材商业化的实现依靠其性能的提高，可以通过更好地理解这些关系来提高性能。为此，本项目将研究GdBa2Cu3O7-δ（GdBCO）超导薄膜的纳米颗粒掺杂、Ba1-xSrxZrO3掺杂的GdBCO /SrTiO3和Sr2Nb2O7掺杂的GdBCO /Sr2Nb2O7多层膜制备、以及Ba1-xSrxZrO3掺杂的GdBCO/YBCO和Sr2Nb2O7掺杂的GdBCO/ YBCO多层膜制备；通过纳米颗粒和多层膜控制生长，明确新型纳米颗粒种类、大小、密度等特征与超导性能之间的关系，揭示纳米颗粒、多层膜和共同作用下的磁通钉扎机制，阐明超导薄膜缺陷和磁通钉扎之间的关系，为磁通钉扎理论提供依据，并且研发出磁场下具有高临界电流密度和临界电流的掺杂GdBCO超导薄膜的脉冲激光沉积方法制备技术。

中文关键词： 脉冲激光沉积；钆钡铜氧；钛酸锶；铌酸锶；锆酸钡

英文摘要： Despite the superconducting technology successes, however, there is still much about high temperature superconductor that we can not understand. But the time has come for concerted study of the interrelationships between processing, film defects, and flux pinning, because crossing the threshold of commerical viability may depend on the kind of performace improvements that can be achieved through a better understanding of these relationships. So the nano particle doping of GdBa2Cu3O7-δ（GdBCO）superconducting films, the preparatrion of Ba1-xSrxZrO3 doped GdBCO /SrTiO3 and Sr2Nb2O7 doped GdBCO /Sr2Nb2O7 multilayer, and the preparation of Ba1-xSrxZrO3 doped GdBCO/YBCO and Sr2Nb2O7 doped GdBCO /YBCO multilayer are studied in this project. Through controlling growth of nano particles and multilayer, the relationship between the characteristic of new nano particels, such as category, size and density, and the performance of superconducting films is explicited, the mechanisms of flux pinning of nano particles, multilayer and combine of two types of artificial pinning are revealed, the relation between the defects in the superconducting films and flux pinning is indicated. A theoretical basis for the flux pinning theory is proved and a preparation technique of doped GdBCO superconducting thin films is developed, which hav

英文关键词： PLD；GBCO；STO；SNO；BZO