低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
研究論文
REBa2Cu3O7-δ超伝導薄膜中の1次元ナノロッドの成長に及ぼす成膜条件の効果
甲斐 英樹堀井 滋一瀬 中喜多 隆介松本 要吉田 隆向田 昌志森 信幸寺西 亮
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2009 年 44 巻 12 号 p. 535-542

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The effects of growth conditions on one-dimensional nanorods in ErBa2Cu3O7-δ films are discussed in terms of their microstructures and superconducting properties. The Ba(Er0.5Nb0.5)O3 nanorods were observed clearly in transmission electron microscopy images of the films. Nanorod morphologies were controlled by managing the growth temperature (TS) and BNO-doping concentration. The nanorods were thinner and denser at a lower TS under a constant BNO-doping concentration. In case of TS=710℃, the diameter and number density of nanorods with 1.5 wt% BNO-doping were 4–6 nm and 2.6×1011/cm2, respectively. As the BNO-doping concentration increased, nanorods were almost aligned in the c-axis direction and grew in uniform size from the substrate to the film surface. The diameter and number density of the nanorods with 5 wt% BNO-doping were ~10 nm and 2.2×1011/cm2, respectively. These nanorods could effectively act as c-axis correlated pinning centers. Consequently, the pinning effects were controlled by their diameter, number density and growth direction of the nanorods by varying the growth conditions.

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© 2009 公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)
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