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Sueyoshi, Tetsuro*; Enokihata, Ryusei*; Hidaka, Yuka*; Irie, Masahiro*; Fujiyoshi, Takanori*; Okuno, Yasuki*; Ishikawa, Norito
Physica C, 582, p.1353824_1 - 1353824_5, 2021/03
Times Cited Count:1 Percentile:7.51(Physics, Applied)We investigated the combined effect of flux pinning by three-directional columnar defects (CDs) in a wide field-angular range of YBaCuOy thin films, where CDs parallel to the -axis and CDs crossing at (=45, 60 and 80) relative to the c-axis were installed by 200 MeV Xe-ion irradiations. The three-directional CDs with 60 form a field angular curve of critical current density Jc with a broad peak centered at magnetic field (B) parallel to the -axis, whereas the Jc shows no peaks around the crossing angles of . When the crossing angle is expanded to =80, a drastic change in the field- angular behavior of Jc is induced: there is not a large enhancement of around B//c. We also demonstrated that the combined configuration consisting of CDs at = 0, 45, 60 and 80 provides a uniform enhancement of over a wide angular-region.