E-J Characteristics in a Bi-2223 Silver-Sheathed Tape Wire

                          in a wide Range of Electric Field



T. Kodama____________1), M. Fukuda1), Y. Hayashi1), E. S. Otabe1), T. Matsushit*
 *a1);2), K. Itoh3)
1)Kyushu Institute of Technology, 680-4 Kawazu, Iizuka 820-8502, Japan

2)Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan

3)National Research Institute for Metals,1-2-1 Sengen, Tsukuba 305-0047, Japan



  The electric field which high temperature superconductors experience is widel*
 *y ranged depend-

ing on their application. Therefore, it is necessary to estimate the E-J charac*
 *teristics in a wide

range of the electric field. In this paper the E-J characteristics are measured*
 * using a four probe

method and a relaxation method of dc magnetization in high and low ranges of th*
 *e electric field,

respectively, for a Bi-2223 silver-sheathed tape wire.  It is found that the cr*
 *itical indices (z,  )

and the transition field (Bg) obtained from the scaling of E-J curves changed w*
 *ith the range of

the electric field.  This is incompatible with the prediction of the vortex gla*
 *ss-liquid transition

theory. The obtained results systematically and approximately explained by a th*
 *eoretical analysis

based on the flux creep-flow model in which the distribution of flux pinning st*
 *rength is taken into

account.


Mr. Takeshi Kodama

c/o Prof. Matsushita

Department of Computer Science and Electronics

Kyushu Institute of Technology

680-4 Kawazu, Iizuka 820-8502, Japan



tel&fax: +81-948-29-7683

e-mail:kodama@aquarius10.cse.kyutech.ac.jp