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Investigation of In-Field Properties of YBCO Film with Artificial Pinning Centers

  • Hiroyoshi Kobayashi (a1), Satoru Ishida (a2), Kazuhiro Takahashi (a3), Masaya Konishi (a4), Akira Ibi (a5), Seiki Miyata (a6), Yutaka Yamada (a7), Yuh Shiohara (a8), Takeharu Kato (a9) and Tsukasa Hirayama (a10)...

Abstract

We have investigated the thickness dependence of critical current for YBa2Cu3O7-x (YBCO) film with artificial pinning centers on metallic substrate. Artificial pinning centers were introduced by the pulsed laser deposition (PLD) using YBCO target including YSZ particles. The film over 1 μm in thickness exhibited with high critical current (Ic) of 40.7A in applied magnetic field of 3T parallel to the c-axis at 77K. This value was 5 times as high as the normal YBCO film without artificial pinning centers. The large Ic enabled us to approach to a practical application in the near future. Furthermore, it was clarified that the columnar nano-structure formed in the film, we call “the bamboo structure”, was a dominant pinning center because each Jc-θ curve of all thick films formed a universal line by the normalization of Jc. In addition, it was also found that YSZ addition has an optimal concentration for pinning by the study of YSZ concentration in the film.

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1 Yamada, Y., Ibi, A., Hukushima, H., Kuriki, R., Takahashi, K., Kobayashi, H., Ishida, S., Konishi, M.,.Miyata, S., Watanabe, T., Kato, T. and Hirayama, T., Proc. Int. Cryog. Mater. Conf. 52B, 720 (2005).
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6 Muroga, T., Watanabe, T., Miyata, S., Iwai, H., Yamada, Y., Izumi, T., Shiohara, Y., Kato, T., Sasaki, H., Sugawara, Y., Hirayama, T., Physica C 412–414, 807 (2004).
7 Miyata, S., Muroga, T., Iwai, H., Ibi, A., Watanabe, T., Yamada, Y., Shiohara, Y., Kato, T., Hirayama, T., T. Appl. Supercond. 15, 2671 (2004).
8 Y. Yamada, Takahashi, K., Kobayashi, H., Konishi, M., Watanabe, T., Ibi, A., Muroga, T., Miyata, S., Kato, T., Hirayama, T., Shiohara, Y., Appl. Phys. Lett. 87, 132502 (2005).
9 Kobayashi, H., Yamada, Y., Ishida, S., Takahashi, K., Konishi, M., Ibi, A., Miyata, S., Kato, T., Hirayama, T. and Shiohara, Y., Proc. Int. Cryog. Mater. Conf. 52B, 729 (2005).
10 Kobayashi, H., Yamada, Y., Ishida, S., Takahashi, K., Konishi, M., Ibi, A., Miyata, S., Kato, T., Hirayama, T. and Shiohara, Y., submitted to Int. Symp. Supercond. (Proc. of Int. Symp.)

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