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Effects of 230 MeV Au irradiation on Bi2Sr2CaCu2Ox |
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| Authors: | Xinghua Gao Yukio Kazumata Hiroaki Kumakura and Kazumasa Togano |
| Institution: | a Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki-ken, 319-11, Japan b National Research Institute for Metals, 1-2-1 Sengen, Tsukuba, Ibaraki-ken, 305, Japan |
| Abstract: | Bi2Sr2CaCu2Ox tapes were irradiated using 230 MeV Au14+ ions. Columnar defects were presumably produced due to irradiation. Zero-field-cooling (ZFC) magnetization increased up to a fluence of 1.6 × 1011 Au+/cm2, but field-cooling (FC) magnetization decreased, indicating the strong pinning effects resulting from the columnar defects. The critical current density as well as the irreversibility field, obtained from the hysteresis loops, were enhanced. Irreversibility fields are fitted by Hirr = A exp(?T/TA). An effective activation energy for flux motion was obtained from the measurements of magnetization relaxation. The features of flux pinning as a result of the columnar defects were compared with those of point defects brought about by 120 MeV O7+ irradiation. |
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