摘要
采用对靶溅射技术制备了YBa2Cu4O8/La2/3Ca1/3MnO3/YBa2Cu4O8(Y-124/LCMO/Y-124)异质结,研究了超导转变温度(TC)随LCMO层厚度(dL)的振荡行为。当dL>dLCR时,TC-dL曲线表现出清晰的非单调行为,而金属-绝缘体转变温度(TMI)仅当dL>dLCR时才能观测到。Y-124/LCMO/Y-124系统中所存在的这种对中间层的依赖关系,显示了铁磁和超导耦合间强烈的相互作用。
YBa2 Cu4O8/La2/3 Ca1/3 MnO3/YBa2Cu4O8 ( Y- 124/LCMO/Y-124) heterostructure was prepared by facing-target sputtering technique. The oscillatory superconducting transition temperature (Tc) was observed when the thickness of LCMO dL is larger than the critical thickness dLCR. The metal-insulator transition temperature (TMI) can only be detected at dL〈 dLCR. The dependence on the spacer layer in LCMO/ Y-124 systems suggests strongly the interplay of ferromagnetic and superconducting couplings.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2005年第5期617-620,共4页
Journal of the Chinese Society of Rare Earths
基金
山东省教育厅科技攻关计划(03A05)
香港研究资助局基金
中国博士后科学基金资助
关键词
高温超导薄膜
庞磁电阻
异质结
层间耦合
稀土
high-Tc films
colossal magnetoresistance
heterostructure
interlayer coupling
rare earths