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Horide, Tomoya; Nagao, Sho; Izutsu, Ryosuke; Ishimaru, Manabu; Matsumoto, Kaname; Kita, Ryusuke, E-mail: horide@post.matsc.kyutech.ac.jp2018
AbstractAbstract
[en] Critical current density (J c) was investigated in YBa2Cu3O7−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 YBa2Cu3O7−δ films containing nanorods. (paper)
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Available from http://dx.doi.org/10.1088/1361-6668/aabe68; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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