机构地区: 聊城大学物理系物理学系
出 处: 《中国稀土学报》 2005年第5期617-620,共4页
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.