Satoru Okayasu
Japan Atomic Energy Agency
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Publication
Featured researches published by Satoru Okayasu.
Physical Review B | 2009
Yutaka Nakajima; Yoshihiro Tsuchiya; Toshihiro Taen; T. Tamegai; Satoru Okayasu; M. Sasase
We report the first realization of columnar defects in Co-doped BaFe
Journal of Applied Physics | 1993
Hiroaki Kumakura; Hitoshi Kitaguchi; Kazumasa Togano; Hiroshi Maeda; Jun-ichi Shimoyama; Satoru Okayasu; Yukio Kazumata
_{2}
Superconductor Science and Technology | 2012
Tsuyoshi Tamegai; Toshihiro Taen; Hidenori Yagyuda; Yuji Tsuchiya; Shyam Mohan; Tomotaka Taniguchi; Yasuyuki Nakajima; Satoru Okayasu; Masato Sasase; Hisashi Kitamura; T. Murakami; T. Kambara; Yasuyuki Kanai
As
Applied Physics Letters | 2007
Seiji Sakai; Isamu Sugai; Seiji Mitani; Koki Takanashi; Yoshihiro Matsumoto; Hiroshi Naramoto; Pavel V. Avramov; Satoru Okayasu; Yoshihito Maeda
_{2}
Physica C-superconductivity and Its Applications | 2003
Ken’ichi Takahashi; Kazuo Satoh; Tsutomu Yotsuya; Satoru Okayasu; Kiichi Hojou; Masaki Katagiri; Atsushi Saito; Akira Kawakami; Hisashi Shimakage; Zhen Wang; Takekazu Ishida
single crystals by heavy-iron irradiation. The columnar defects are confirmed by transmission electron microscopy and their density is about 40 % of the irradiation dose. Magneto-optical imaging and bulk magnetization measurements reveal that the critical current density is strongly enhanced in the irradiated region. We also find that vortex creep rates are strongly suppressed by the columnar defects. We compare the effect of heavy-ion irradiation into Co-doped BaFe
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 2003
Noriaki Matsunami; M. Sataka; A. Iwase; Satoru Okayasu
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Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 2000
Takeo Aruga; Y. Katano; T Ohmichi; Satoru Okayasu; Yukio Kazumata
As
Physica C-superconductivity and Its Applications | 2002
Satoru Okayasu; Masato Sasase; Kiichi Hojou; Y. Chimi; A. Iwase; H. Ikeda; Ryozo Yoshizaki; T. Kambara; H. Sato; Y. Hamatani; A. Maeda
_{2}
Physica C-superconductivity and Its Applications | 2002
Hijiri Kito; Akira Iyo; Manabu Hirai; A. Crisan; Madoka Tokumoto; Satoru Okayasu; Masahito Sasase; Hideo Ihara
and cuprate superconductors.
Journal of Applied Physics | 1992
Hiroaki Kumakura; Shozo Ikeda; Hitoshi Kitaguchi; Kazumasa Togano; Hiroshi Maeda; J. Kase; Takeshi Morimoto; Satoru Okayasu; Yukio Kazumata
180‐MeV Cu11+ and Br11+ irradiations and 3‐MeV electron irradiation were carried out on textured Bi‐2212 tapes and the effects of irradiation on the microstructure and superconducting properties were investigated. Ion irradiation, which creates linear tracks, is very effective in increasing both intragrain Jc and irreversibility field at temperatures below 60 K when field is parallel to the tracks. At 60 K, an order of magnitude higher Birr is obtained for both Cu11+ and Br11+ irradiations. Electron irradiation which creates point defects, on the other hand, is not as effective as ion irradiation except for low temperatures of ∼4.2 K. Apparent pinning potential energy U0 was increased by ion irradiation from ∼15 to ∼40 meV at 41.8 K, while U0 was unchanged by the electron irradiation. However, even U0 of the ion‐irradiated sample is still small. This small U0 increases flux creep at temperatures above 60 K and makes ion irradiation less effective. A small increase of transport Jc was obtained by both ion ...