摘要
Eu掺杂(取代)导致Y系YBa2Cu3O7-δ(YBCO)超导材料临界电流密度增强,晶格应变被认 为是主要原因。本文研究了Eu掺杂YBa2-xEuxCu3O7-δ超导体的结构和应变,并从容忍因子讨论了 钙钛矿单元的结构稳定性和晶格畸变,以及结构与电输运的相互关系;当x<0.15时,样品中没有 杂相。我们发现Eu3+/Eu2+离子优先替代Ba位的Ba,对电输运几乎没有影响。研究还表明氧含量 对超导转变温度Tc几乎没有影响。进一步研究了所有正常态样品的自旋能隙打开温度与超导输 运及结构变化之间的关系。
Eu doped YBa2-xEuxCu3O7-δ superconductors with x〈 0.5 were synthesized and studied. The microstructure of YBa2-xEuxCu3O7-δ superconductors was characterized by X - ray diffraction with Rieweld refinements. Eu may occupy Y- site, Ba - sites and Cu - site,which depends on its content. The orthorhombic strain vary with the content of Eu, which may affect the electronic transportation. We found that Eu^3+/Eu^2+ ions prefer to replace Ba at Ba sites, which gives little influence on superconductivity. The spin gap temperature, Ts, in the normal state decreases with increasing the Eu contetn.
出处
《常熟理工学院学报》
2005年第6期14-19,共6页
Journal of Changshu Institute of Technology
基金
国家自然科学基金资助项目(10474031
90201039)江苏省新型功能材料重点建设实验室基金资助项目(05KFJJ007).