Microstructures and critical current densities of YBCO films containing structure-controlled BaZrO3 nanorods

Ataru Ichinose, Kazuaki Naoe, Tomoya Horide, Kaname Matsumoto, Ryusuke Kita, Masashi Mukaida, Yutaka Yoshida, Shigeru Horii

    研究成果: Contribution to journalArticle査読

    75 被引用数 (Scopus)

    抄録

    BaZrO3 nanorods are known to be effective pinning centers as c-axis-correlated pinning centers. Furthermore, BaZrO3 nanorods in REBa2Cu3Oy (RE: rare-earth element) films are formed by self-assembled stacking of BaZrO3 using a target mixture of a superconductor and BaZrO3 for pulsed-laser deposition, which is a very easy fabrication technique. The density of BaZrO3 nanorods in YBa2Cu3Oy (YBCO) films can be controlled by varying the BaZrO3 content in a target. The BaZrO3 addition has two functions for superconductivity; one is the improvement of pinning forces due to the addition of pinning centers and the other is T c degradation. The optimum BaZrO3 addition for J c improvement in magnetic fields is found to be around 3wt% because of a trade-off between the two functions described above. Furthermore, the length of BaZrO3 nanorods is found to be controlled using two types of target: pure YBCO and a mixture of YBCO and BaZrO3. Varying the BaZrO3 nanorod length has an effect on the pinning mechanism. In particular, magnetic field angle dependences of Jc are varied from c-axis-correlated pinning to nearly random pinning by changing the nanorod length. The magnetic field at the crossover of the pinning mechanism seems to be adjusted by the BaZrO3 nanorod length.

    本文言語英語
    ページ(範囲)1144-1150
    ページ数7
    ジャーナルSuperconductor Science and Technology
    20
    12
    DOI
    出版ステータス出版済み - 12 1 2007

    All Science Journal Classification (ASJC) codes

    • セラミックおよび複合材料
    • 凝縮系物理学
    • 金属および合金
    • 電子工学および電気工学
    • 材料化学

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