酸化物超伝導体の薄膜成長と構造欠陥に関する研究

氧化物超导体薄膜生长及结构缺陷研究

• 批准号: 03211212
• 负责人: 弘津 禎彦
• 金额: $ 0.77万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03211212/
• 关键词: 酸化物超伝導体; YBa_2Cu_3O_<7‐δ>; 薄膜成長; 構造欠陥; 電顕観察

平成3年度の研究内容は次の通りである。(1)結晶配向性の測定 MgO(001)単結晶基板上に、MOCVD法により成膜したYBa_2Cu_3O_<7‐δ>膜(YBCO膜)の配向性をX線φ‐scan法(Schultz法)によって調べた。反射面は{113}を用いた。測定の結果、YBCO膜には、Epitaxial成長粒を大部分含む膜(方位関係:[001]YBCO//[001]MgO,[100]YBCO//[100]MgO)、および、a‐軸方位が[100]MgOとδだけ異なったMisorientation粒(方位関係:[001]YBCO//[001]MgO,[001]YBCO δ from[100]MgO)とEpitaxial成長粒の混在した膜の双方が観察された。特に、後者では、δ=27,45ﾟの膜が頻繁に観察されたが、これは、Mgo(001),YBCO(001)格子間での安定な擬対応格子がこれらの方位関係下で成立することと関係する。 これらの膜のジョセフソン特性測定を行った結果、Misorientation膜で優れたジョセフソンIーV特性を得られ、大傾角粒界がジョセフソン効果に寄与することが判明した。(2)粒界構造、界面構造の観察 ジョセスソン特性を与えるYBCO大傾角(27ﾟ,45ﾟなど)粒界につき、TEMによるPlan‐View観察を行った結果、大傾角粒界で囲まれた結晶粒は、内部にいくつかの小傾角粒界(傾角1〜2ﾟ)を含んでいることが判り、また、大傾角粒界の走る面内方位は、対応格子的には低Σ値の方位に非常に近いことなどが見いだされた。粒界の構造乱れの幅は1nm以下(超伝導電流の干渉距離以下)であり、この領域でジョセフソン効果が起こる。Misorientation粒、Epitaxial粒成長の膜につき、YBCO/MgO界面構造の断図観察を行った結果、Mirorientation粒/MgO界面が例外なく原子レベルで平坦なのに対し,Epitaxial粒/MgO界面では多くの原子ステップが見られ、また、多くの積層欠陥が観察された。MgO表面の原子ステップの存在の程度が、YBCO膜の配向に影響していると考えられる。

In Pingcheng, the content of the study was reviewed for the second time. The main results are as follows: (1) the orientation of YBa2Cu3OTX film (YBCO film) was determined by X-ray diffraction φ-scan method (Schultz method). The results are as follows: (1) the orientation of MgO (001) crystal substrate and MOCVD method. The reflector "{113}" is used. The results showed that most of the films (azimuth: YBCO// [001] MgO, YBCO// [100] MgO), Misorientation (azimuth), YBCO// (MgO), YBCO δ from (MgO) were mixed with Epitaxial long grains. Special, the latter, δ = 27, the film is 45 years old, and the film is used to observe the stability of the cell, the location of the grid, and the location of the grid, which is set up under the location of the grid, which is stable and stable in the lattice of Mgo and YBCO. In this paper, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the determination of the characteristics of the film, the results of the (2) the grain boundary and interface are made to observe the characteristics of the grain boundary and the large angle of YBCO (27). The results of the experiments are as follows: the grain boundary, the TEM Plan-View, the grain boundary, the grain boundary, the grain boundary The size of the grain boundary is lower than the 1nm (the distance of the superconducting current is below). If there is a problem in the field, the error will occur. Misorientation particles, Epitaxial particles form a long thin film, YBCO/MgO interface is made to observe the results of experiments, Mirorientation particles

项目成果

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H.Suzuki、Y.Fujiwara、Y.Hirotsu、J.Chen、K.Nakajima、T.Yamashita：“约瑟夫森结的 YBCO 薄膜的自然和人工晶界” Physica C. 190. 75-78 (1991)

J.Chen,T.Yamashita,H.Sasahara,H.Kurosawa,H.Suzuki,Y.Hirotsu: "Possible Three‐Terminal Device with YBCO Angln Grain Boundary" IEEE Trans.on Appl.Superconductivity. 1. 102-107 (1991)

J.Chen、T.Yamashita、H.Sasahara、H.Kurosawa、H.Suzuki、Y.Hirotsu：“具有 YBCO Angln 晶界的可能三端器件”IEEE Trans.on Appl.Superconductivity 1. 102-107（ 1991)

J.Chen,T.Yamashita.H.Suzuki,K.Nakajima,h.Kurosawa,Y.Mutoh,Y.Hirotsu,H.Myoren,Y.Osaka: "YBa_2Cu_3O_<7‐δ> Angle Grain Boundary Junction on Si Bicrystal Substrate" Jpn.J.Appl.Phys.30. 1964-1968 (1991)

J.Chen,T.Yamashita.H.Suzuki,K.Nakajima,h.Kurosawa,Y.Mutoh,Y.Hirotsu,H.Myoren,Y.Osaka：“YBa_2Cu_3O_<7‐δ>硅双晶上的角晶界结基材”Jpn.J.Appl.Phys.30. 1964-1968 (1991)

Y.Hirotsu,Y.Ikeda,Y.Ichinose,S.Nagakura.T.Komatsu,K.Matusita: "Modulated Struture of the High‐Tc Superconductor Bi_<2‐X>Pb_XSr_2CaCu_2O_y" J.Electron Microscopy. 40. 147-156 (1991)

Y.Hirotsu、Y.Ikeda、Y.Ichinose、S.Nagakura.T.Komatsu、K.Matusita：“高温超导体 Bi_<2-X>Pb_XSr_2CaCu_2O_y 的调制结构”J.电子显微镜 40. 147- 156 (1991)

H.Suzuki,H.Kurosawa,K.Miyagawa,Y.Hirotsu,M.Era,T.Yamshita,H.Yamane,T.Hirai: "Josephson Effect and Small‐Angle Grain Boundary in YBCO Thin Film Bridge" IEEE Trans.on Magnetics. 27. 3320-3323 (1991)

H. Suzuki、H. Kurosawa、K. Miyakawa、Y. Hirotsu、M. Era、T. Yamshita、H. Yamane、T. Hirai：“YBCO 薄膜桥中的约瑟夫森效应和小角度晶界”IEEE Trans。关于磁学。 27. 3320-3323 (1991)