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논문 기본 정보

자료유형
학술저널
저자정보
김정호 (School of Metallurgical and materials Engineering, Sungkyunkwan University) 김규태 (School of Metallurgical and materials Engineering, Sungkyunkwan University) 임준형 (School of Metallurgical and materials Engineering, Sungkyunkwan University) 장석헌 (School of Metallurgical and materials Engineering, Sungkyunkwan University) 노연봉 (School of Metallurgical and materials Engineering, Sungkyunkwan University) 주진호 (School of Metallurgical and materials Engineering, Sungkyunkwan University) 최세용 (School of Information and Communicatin Engineering, Sungkyunkwan University) 나완수 (School of Information and Communicatin Engineering, Sungkyunkwan University) 홍계원 (Department of Electronics Enginering, Korea Polytechnic University)
저널정보
한국초전도학회 Progress in superconductivity Progress in superconductivity 제6권 제1호
발행연도
2004.1
수록면
79 - 83 (5page)

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We fabricated Bi-2223/Ag superconductor tape with 55 filaments and estimated the magnetic field dependence of critical current (I$_{c}$) and index n (n) up to 30 T at 4.2 K. The I$_{c}$ and n were characterized as a function of external magnetic field parallel to the tape surface on increasing and decreasing field, using a 35 T hybrid magnet. The $I_{c}$ was estimated to be 325 A, and n was 32, 22, and 26 in the electric field range of $0.1 ∼1\mu$V/cm, 1∼10 $\mu$V/cm, and 0.1∼10 $\mu$V/cm, respectively, under self-field at 4.2 K. It was observed that $I_{c}$ was dependent on magnitude of magnetic field and it decreased exponentially as the field increased; in a parallel and increasing field, It was 128 A at 30 T which is approximately 40% of critical current in self-field. In addition, the $I_{c}$ was higher on decreasing field than that on increasing one. On the other hand, n did not significantly depend on field strength up to 30 T, nor varied on whether increasing or decreasing field; n value in 0.1∼1 $\mu$V/cm was 23.0$\pm$5.2 and 27.8$\pm$8.0 on increasing and decreasing field, respectively. The n value on decreasing magnetic field was slightly higher than that on increasing field. This hysteretic behavior of n was similar to that of$ I_{c}$, which is related to the trapped flux at the grain boundary.ary.

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