Induced lattice strain in epitaxial Fe-based superconducting films on CaF2 substrates: A comparative study of the microstructures of SmFeAs(O,F), Ba(Fe,Co)2As2, and FeTe0.5Se0.5
Induced lattice strain in epitaxial Fe-based superconducting films on CaF2 substrates: A comparative study of the microstructures of SmFeAs(O,F), Ba(Fe,Co)2As2, and FeTe0.5Se0.5
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DOI：
10.1063/1.4869961
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发表时间：
2014-03-24
影响因子：
4
通讯作者：
Naito, Michio
中科院分区：
文献类型：
--
作者：
Ichinose, Ataru;Tsukada, Ichiro;Naito, Michio
用透射电子显微镜研究了在CaF2衬底上制备的SmFeAs(O，F)、Ba(Fe，Co)(2)As-2和FeTe0.5Se0.5的微观结构。SmFeAs(O，F)/CaF2界面陡峭，没有无序层。相反，在Ba(Fe，Co)(2)As-2和FeTe0.5Se0.5的情况下，界面上发生了化学反应。对于Ba(Fe，Co)(2)As-2和FeTe0.5Se0.5，反应层位于界面的两侧。我们发现，与在氧化物衬底上制备的超导薄膜相比，CaF2衬底上的三种超导薄膜的晶格畸变提高了T-C值。这种晶格变形的来源因超导材料而异。(C)2014 AIP出版有限责任公司。
The microstructures of SmFeAs(O,F), Ba(Fe,Co)(2)As-2, and FeTe0.5Se0.5 prepared on CaF2 substrates were investigated using transmission electron microscopy. The SmFeAs(O,F)/CaF2 interface is steep, without a disordered layer. By contrast, a chemical reaction occurs at the interface in the cases of Ba(Fe,Co)(2)As-2 and FeTe0.5Se0.5. The reaction layers are located on opposite sides of the interface for Ba(Fe,Co)(2)As-2 and FeTe0.5Se0.5. We found that the lattice distortion of the three superconducting films on the CaF2 substrates enhances the T-C values compared with films prepared on oxide substrates. The origin of this lattice deformation varies depending on the superconducting material. (C) 2014 AIP Publishing LLC.