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Combined effect of flux pinning by three-directional columnar defects in a field-angular region of high-$$T_{rm c}$$ superconductors

Sueyoshi, Tetsuro*; Enokihata, Ryusei*; Hidaka, Yuka*; Irie, Masahiro*; Fujiyoshi, Takanori*; Okuno, Yasuki*; Ishikawa, Norito   

We investigated the combined effect of flux pinning by three-directional columnar defects (CDs) in a wide field-angular range of YBa$$_{2}$$Cu$$_{3}$$Oy thin films, where CDs parallel to the $$c$$-axis and CDs crossing at $$pm$$$$theta$$ ($$theta$$=45$$^{circ}$$, 60$$^{circ}$$ and 80$$^{circ}$$) relative to the c-axis were installed by 200 MeV Xe-ion irradiations. The three-directional CDs with $$theta$$$$leqq$$$$pm$$60$$^{circ}$$ form a field angular curve of critical current density Jc with a broad peak centered at magnetic field (B) parallel to the $$c$$-axis, whereas the Jc shows no peaks around the crossing angles of $$pm$$$$theta$$. When the crossing angle is expanded to $$theta$$=$$pm$$80$$^{circ}$$, a drastic change in the field- angular behavior of Jc is induced: there is not a large enhancement of $$J_{rm c}$$ around B//c. We also demonstrated that the combined configuration consisting of CDs at $$theta$$= 0$$^{circ}$$, $$pm$$45$$^{circ}$$, $$pm$$60$$^{circ}$$ and $$pm$$80$$^{circ}$$ provides a uniform enhancement of $$J_{rm c}$$ over a wide angular-region.



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Category:Physics, Applied



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