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YBa_2Cu_4O_8/La_(2/3)Ca_(1/3)MnO_3/YBa_2Cu_4O_8异质结中的超导转变温度

Superconducting Transition Temperature in YBa_2Cu_4O_8/La_(2/3)Ca_(1/3)MnO_3/YBa_2Cu_4O_8 Heterostructure
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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
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