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Journal Articles

Flux pinning by columnar defects along $$a$$-axis in $$a$$-axis oriented YBCO thin films

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

IEEE Transactions on Applied Superconductivity, 29(5), p.8003204_1 - 8003204_4, 2019/08

https://doi.org/10.1109/TASC.2019.2896473
 Times Cited Count：8 Percentile：37.35(Engineering, Electrical & Electronic)

Columnar defects (CDs) along $$a$$-axis were installed into an in-plane aligned $$a$$-axis-oriented YBa$$_{2}$$Cu$$_{3}$$O$$_{y}$$ 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 $$J_{rm c}$$ 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 $$J_{rm c}$$ at B$$||$$$$ab$$, on the other hand, is weakened by the introduction of CDs.

Journal Articles

Angular behavior of $$J_{rm c}$$ in GdBCO-coated conductors with crossed columnar defects around $$ab$$ plane

Sueyoshi, Tetsuro*; Iwanaga, Yasuya*; Fujiyoshi, Takanori*; Takai, Yosuke*; Mukaida, Masashi*; Kudo, Masaki*; Yasuda, Kazuhiro*; Ishikawa, Norito

IEEE Transactions on Applied Superconductivity, 27(4), p.8001305_1 - 8001305_5, 2017/06

https://doi.org/10.1109/TASC.2016.2637338
 Times Cited Count：9 Percentile：40.25(Engineering, Electrical & Electronic)

We investigated in detail the flux pinning properties around B $$||$$ $$ab$$ for GdBCO coated conductors with crossed columnar defects produced by heavy-ion irradiation, where the crossing angle was systematically controlled in the range from 5 to 15 relative to the ab-plane. A single peak of critical current density $$J_{rm c}$$ centered at B $$||$$ $$ab$$ occurs for the crossing angle of 5, where an upward shift in $$J_{rm c}$$ can be observed compared to an unirradiated sample. As the crossing angle is larger, the $$J_{rm c}$$ peak becomes smaller and broader while maintaining the peak at B $$||$$ $$ab$$. Three $$J_{rm c}$$ peaks emerges at B $$||$$ $$ab$$ and at the two irradiation angles, independently from the others.

Journal Articles

Flux pinning properties in GdBCO coated conductors containing columnar defects with splay plane parallel to current direction

Furuki, Yuichi*; Sueyoshi, Tetsuro*; Kai, Takashi*; Iwanaga, Yasuya*; Fujiyoshi, Takanori*; Ishikawa, Norito

Physica C, 518, p.58 - 62, 2015/11

https://doi.org/10.1016/j.physc.2015.04.008
 Times Cited Count：6 Percentile：24.90(Physics, Applied)

In order to reveal the influence of crossing angle of one-dimensional pinning centers on angular dependence of critical current density Jc, heavy-ion irradiation was performed to introduce columnar defects (CDs) crossing relative to the c-axis into GdBCO coated conductors, where the splay plane consisting of the two directions of CDs is parallel to the current flow direction. For the sample containing CDs with 15$$^{circ}$$, a single and sharp peak was observed around B$$||$$c in the angular dependence of Jc. When the crossing angle was extended to 45$$^{circ}$$, the single Jc-peak became broader, which was a gently-sloping mountain-like shape centered at B$$||$$c. For 75$$^{circ}$$, on the other hand, a quite different behaviour of Jc from the other irradiated samples was observed, which was analogous to the angular dependence of Jc typical of three dimensional pinning centers.

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