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Sueyoshi, Tetsuro*; Enokihata, Ryusei*; Yamaguchi, Hiroshi*; Fujiyoshi, Takanori*; Okuno, Yasuki*; Ishikawa, Norito
IEEE Transactions on Applied Superconductivity, 31(5), p.8000305_1 - 8000305_5, 2021/08
Angular behaviors of critical current density Jc at 77 K, 1 T were investigated in YBCO films with columnar defects (CDs) tilted at small angles to the ab-plane before and after the additional introduction of CDs at different angles, where CDs were installed by heavy-ion irradiations. The enhanced Jc at 
by the initial irradiation at 
i=
85
relative to the c-axis was reduced by the additional irradiation at i=75, whereas the Jc was increased at the intermediate angle between the two irradiation angles. The addition of CDs at i=0 also lowered the Jc around , which were enhanced by the initial irradiation angles of i=80.
superconductorsSueyoshi, 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：3 Percentile：17.11(Physics, Applied)We investigated the combined effect of flux pinning by three-directional columnar defects (CDs) in a wide field-angular range of YBa
Cu
Oy 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.
