Observation of Mesoscopic Structures in NdBa2Cu3O7-δ by Small-Angle Neutron Scattering
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概要
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In order to clarify the origin of the high critical current density ($J_{\text{c}}$) of NdBa2Cu3O7-δ (Nd123), we investigated the inhomogeneities in this material by small-angle neutron scattering (SANS) experiments. As a result of numerical calculations, it was found that the anisotropic scattering patterns and radial intensity profiles can be explained by the existence of elliptic cylindrical objects of which the cylindrical axis is parallel to the crystallographic $c$-axis. Long and short elliptic axis lengths and the height of the elliptic cylinders in the high-$J_{\text{c}}$ sample are about 400, 200 and 100 nm, and those of the low-$J_{\text{c}}$ sample are about 200, 100 and 50 nm. Since these two samples have been heat-treated in different manners, it is suggested that sizes of the elliptic cylinders are affected by the heat treatments and this change in scale, as a result, increases or decreases the $J_{\text{c}}$ characteristics of the samples.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2003-08-15
著者
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Suzuki Jun-ichi
Advanced Science Research Center Japan Atomic Energy Agency
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Kuroda Kiyoshi
Superconductivity Research Laboratory International Superconductivity And Technology Center (istec)
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Miyata Seiki
Department Of Materials Science And Engineering Kyoto University
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Koshizuka Naoki
Superconductivity Research Laboratory International Superconductivity And Technology Center (istec)
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Osamura Kozo
Department Of Materials Science And Engineering Kyoto University
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Koshizuka Naoki
Superconductivity Research Laboratory, International Superconductivity Technology Center, Tokyo 135-0062, Japan
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Osamura Kozo
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan
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Miyata Seiki
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan
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