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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：37.12(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：40.11(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 of correlated pinning at low temperatures in ErBCO films with inclined columnar defects

Awaji, Satoshi*; Namba, Masashi*; Watanabe, Kazuo*; Kai, Hideki*; Mukaida, Masashi*; Okayasu, Satoru

Journal of Applied Physics, 111(1), p.013914_1 - 013914_4, 2012/01

https://doi.org/10.1063/1.3675181
 Times Cited Count：27 Percentile：68.69(Physics, Applied)

The effect of $$c$$-axis correlated pinning on the critical current density $$J$$$$_{c}$$ at low temperatures under high magnetic fields was investigated on the basis of the transport measurements of $$J$$$$_{c}$$ and irreversibility field B$$_{irr}$$ properties of an ErBa$$_{2}$$Cu$$_{3}$$O$$_{y}$$ film with inclined columnar defects. The contribution of correlated pinning on $$J$$$$_{c}$$ decreased drastically with decreasing temperature under high magnetic fields above the matching field. At low temperatures, the presence of a matching field limited the pinning force for correlated pinning, while the ratio of the maximum pinning force of the correlated pinning to the random one was proportional to the inverse of B$$_{irr}$$. In order to improve the critical current properties at low temperatures under high magnetic fields, an increase in the matching field and/or the introduction of strong random pinning are effective.

Journal Articles

Cooperative behavior of the random and correlated pinning in Er123 films with columnar defects

Awaji, Satoshi*; Namba, Masashi*; Watanabe, Kazuo*; Ito, Shun*; Aoyagi, Eiji*; Kai, Hideki*; Mukaida, Masashi*; Okayasu, Satoru

IEEE Transactions on Applied Superconductivity, 21(3), p.3192 - 3195, 2011/06

https://doi.org/10.1109/TASC.2010.2089588
 Times Cited Count：7 Percentile：39.46(Engineering, Electrical & Electronic)

The flux pinning behaviors for the heavy ion irradiated Er123 films are investigated based on the detailed $$J$$$$_{rm c}$$ ($$B$$, $$T$$, $$theta$$) properties. The double peaks of $$F$$$$_{rm p}$$ curves for $$B$$//c appear in case of the matching field of 0.3 T along $$c$$-axis and 1.7 T tilted from $$c$$-axis. In addition, the peaks on $$J$$$$_{rm c}$$ ($$theta$$) at $$theta$$ = 0$$^{circ}$$ (B//c), which originate from the columnar defects, decrease with increasing magnetic field but increase again near the irreversibility field. We found that the cooperation model of the $$c$$-axis correlated and random pinning centers can describe the observed double peak behavior of $$F$$$$_{rm p}$$(B) and the angular dependence of $$J$$$$_{rm c}$$ related to the correlated pinning.

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