EFFECT OF CARRIER DOPING ON IRREVERSIBILITY FIELD OF Bi-2212 SUPERCONDUCTORS


Title, author, abstract

title
EFFECT OF CARRIER DOPING ON IRREVERSIBILITY FIELD OF Bi-2212 SUPERCONDUCTORS
authors
M. Kiuchi1, M. Tagomori1, H. Yamato1, T. Matsushita1 and M. Wakata2
1 Department of Computer Science and Electronics, Kyushu Institute of Technology,
680--4 Kawazu, Iizuka, 820 JAPAN
2 Advanced Technology R \& D Center, Mitsubishi Electric Corp.,
1--1--57 Miyasita, Sagamihara, Kanagawa, 229, Japan
abstract
The irreversibility field and the critical current density in Bi-2212 superconductors prepared under the conditions of various oxygen pressure were measured in the magnetic field normal and parallel to the $c$-axis. It is found that the irreversibility field is shifted to higher temperature with increasing carrier doping. The improvement of the irreversibility field is attributed to the improvement of the dimensionality of the superconductor and the strengthening of flux pinning. These contributions to the irreversibility field were separated using the flux creep theory and it is found that the enhancement comes mostly from the variation in the dimensionality of the superconductor.
Original paper appears in
9th International Symposium on Superconductivity
October 21--25, 1996
Sapporo, Hokkaido, Japan