Flux Pinning by Columnar Defects along a-axis in a-axis Oriented YBCO Thin Films

Tetsuro Sueyoshi, Yasuya Iwanaga, Takanori Fujiyoshi, Yosuke Takai, Mitsuhiro Muta, Masashi Mukaida, Ataru Ichinose, Norito Ishikawa

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    2 Citations (Scopus)

    Abstract

    Columnar defects (CDs) along a-axis were installed into an in-plane aligned a-axis-oriented YBa2Cu3Oy film by using heavy-ion irradiation, in order to clarify the influence of CDs on flux pinning properties around B // ab. The critical current density Jc at B // c significantly decreases after the irradiation, since the CDs act as a channel for flux creep along their length. The magnetic field dependence of Jc at B // ab, on the other hand, is weakened by the introduction of CDs. This means that the CDs can trap flux lines at B // ab, whereas naturally growth defects working as effective ab-correlated PCs exist. The trapping angle of CDs along the a-axis is extremely narrow (∼5.8°) in comparison with CDs along the c-axis and is roughly coincides with other ab-correlated PCs. The small trapping angle of CDs along the a-axis is attributed to strong line tension energy of flux lines with elliptical core around B // ab.

    Original languageEnglish
    Article number8636249
    JournalIEEE Transactions on Applied Superconductivity
    Volume29
    Issue number5
    DOIs
    Publication statusPublished - Aug 2019

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Electrical and Electronic Engineering

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