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Growth mechanism of nanorods in REBa2Cu3Oy films (RE: rare-earth element) |
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| Authors: | A. Ichinose H. Kai M. Mukaida S. Horii R. Kita K. Matsumoto Y. Yoshida |
| Affiliation: | 1. Central Research Institute of Electric Power Industry, Electric Power Engineering Research Laboratory, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan;2. Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, Fukuoka 819-0395, Japan;3. Kochi University of Technology, Tosayamada, Kochi 782-8502, Japan;4. Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan;5. Kyushu Institute of Technology, 1-1 Sensui-cho Tobata-ku, Kitakyushu 804-8550, Japan;6. Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan |
| Abstract: | Critical current density under magnetic fields has been improved by the introduction of artificial pinning centers. Nanorods in REBa2Cu3Oy films are significantly effective as c-axis-correlated pinning centers. However, nanorods sometimes tilt from the c-axis direction of superconducting films. To understand the mechanism of nanorod tilting, ErBa2Cu3Oy films containing Ba(Nb0.5Er0.5)O3 (BNO) nanorods were deposited on a SrTiO3 single crystal with a vicinal surface. Microstructures of the nanorods were examined by transmission electron microscopy (TEM). As a result, it was found that BNO nanorods grew diagonally from steps of the substrate surface in cross-sectional TEM images. The mechanism of the diagonal growth of nanorods can be explained by the segregation coefficient. |
| Keywords: | A1. Nanostructures A1. Segregation A1. Transmission electron microscopy A3. Pulsed-laser deposition process B2. Oxide superconducting films |
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