Structural modulation in bismuth cuprate superconducting film with continuous epitaxial growth

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• 作者：Satoru Kaneko ; Kensuke Akiyama ; Takeshi Ito ; Yoshitada Shimizu ; Yasuo Hirabayashi ; Seishiro Ohya ; Hiroshi Funakubo ; Mamoru Yoshimoto
• 关键词：A1. Incommensurate structure ; A1. Reciprocal space mapping ; A1. XRD ; A3. Thin film ; B2. Oxide superconducting materials
• 刊名：Journal of Crystal Growth
• 出版年：2008
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：April 2008
• 卷：310
• 期：7-9
• 页码：1713-1717
• 文件大小：851 K

摘要

X-ray reciprocal space mapping (XRSM) revealed asymmetric intensity distribution of satellite peaks, caused by structural modulation, so-called supercell (SC), of the bismuth cuprate film Bi₂Sr₂Ca₁Cu₂O_x (Bi-2212). How unit cells are distorted to form SC is investigated on multilayered structure, which induces extra strain into unit cells. In order to investigate the effect of displacement of relatively heavy bismuth on intensity and distribution of SC peaks on XRSM, modulation waves were applied into not the whole crystal but to specified atoms constructing structural modulation as a simple crystal model, and the simulation was compared to the experimental results. To the contrary to multilayer, in this study, relatively thick films were prepared, which released the strain in its single layer. Epitaxial growth was verified by X-ray diffraction with relation of 32 rotation with respect to the surface normal of the initial epitaxial Bi-2212 film.