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Superconducting characteristics of (Bi, Pb)-2223 single crystals with controlled oxygen-content |
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| Authors: | S Kawai ES Otabe M Kiuchi T Matsushita T Nomura H Yamauchi T Motohashi S Okayasu |
| Institution: | aFaculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, 680–4 Kawazu, Iizuka, Fukuoka 820-8502, Japan;bMaterials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuda, Midori-ku, Yokohama 226-8503, Japan;cFaculty of Engineering, Hokkaido University, N13, W8 Kita-ku, Sapporo 060-8628, Japan;dJapan Atomic Energy Agency, 2–4 Shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan |
| Abstract: | Critical current density was measured for oxygen-controlled (Bi, Pb)-2223 single crystals before and after the irradiation with gold ions in a magnetic field parallel to the irradiation-induced defects along the c-axis. Eleven specimens prepared in different annealing conditions were measured. The condensation energy density of each specimen was evaluated from the observed critical current density by using the summation theory of pinning forces of columnar defects and the flux creep theory. It was found that the specimen heat-treated at 1 atm in oxygen atmosphere has the highest condensation energy density among all specimens. Hence, it is speculated that the optimum oxygen pressure for the anneal is around 1 atm. |
| Keywords: | Bi-2223 single crystal Columnar defect Critical current density Irreversibility field Condensation energy density |
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