Geometric and compositional factors on critical current density in YBa2Cu3O7－δ films containing nanorods
Geometric and compositional factors on critical current density in YBa2Cu3O7－δ films containing nanorods
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几何和成分因素对含纳米棒YBa2Cu3O7－δ薄膜临界电流密度的影响
DOI：
10.1088/1361-6668/aabe68
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发表时间：
2018
影响因子：
3.6
通讯作者：
Kaname Matsumoto
中科院分区：
文献类型：
--
作者：
Tomoya Horide;Sho Nagao;Ryosuke Izutsu;Manabu Ishimaru;Ryusuke Kita;Kaname Matsumoto
研究了不同纳米棒材料制备的YBa 2Cu 3 O 7− δ薄膜的临界电流密度（Jc）随纳米棒含量、衬底温度和氧化条件的变化。实现了三种类型的组成情况：薄膜含有应变诱导的氧空位;完全氧化膜含有阳离子成分偏差;和缺氧膜。归一化J c− B行为通过匹配场确定，匹配场是一个几何因子，与组成细节无关。J c−临界温度（T c）关系取决于成分偏差的分布和分数（阳离子成分偏离和应变诱导氧空位）的影响：在完全氧化膜中，由于Tc对纳米棒钉扎强度的影响，Jc值随着Tc的降低而降低;在薄膜沉积后的薄膜冷却过程中，尽管Tc几乎保持不变，但Jc随着氧气压力的降低而降低，这是由于缺氧膜中电流的有效面积减小。因此，J c景观的几何和组成因素的基础上得到的。该研究强调了Jc-T c分析对于了解含有纳米棒的YBa 2 Cu 3 O 7-δ薄膜中的J c的重要性。
Critical current density (J c) was investigated in YBa 2 Cu 3 O 7− δ films containing nanorods prepared with various nanorod materials, with variation of nanorod content, substrate temperature, and oxidization condition. Three types of compositional situation were realized: films containing strain induced oxygen vacancies; fully oxidized films containing cation compositional deviation; and oxygen deficient films. Normalized J c− B behavior was determined via the matching field, which is a geometric factor, regardless of the compositional details. A J c− critical temperature (T c) relation depending on distribution and fraction of compositional deviation (cation compositional deviation and strain induced oxygen vacancies) was found: the J c values decreased with decreasing T c due to the effect of T c on nanorod pinning strength in the fully oxidized films; J c decreased with decreasing oxygen pressure in the film cooling process after film deposition in spite of T c remaining almost the same, due to reduction of the effective area for current flow in the oxygen deficient films. Thus, a J c landscape based on geometric and compositional factors was obtained. The study highlights the importance of the J c− T c analysis in the understanding of J c in YBa 2 Cu 3 O 7− δ films containing nanorods.