Comparative study of pulsed field magnetization for Y-Ba-Cu-O and Sm-Ba-Cu-O

We have performed a comparative study of the magnetization behavior with ap plying pulse fields for Y-Ba-Cu-O and Sm-Ba-Cu-O, which exhibit the differe nt field dependence of critical current densities (J(c)'s). Time variation of the field was monitored with the Hall probe sensor which is attached to the sample surface by varying the maximum field values from 0 to 2 T. In a low field region, the trapped magnetic field of Sm-Ba-Cu-O was slightly sma ller than that of Y-Ba-Cu-O, however, it exceeded the value of Y-Ba-Cu-O in a high field region. The results reflect the J(c)-B characteristic of Sm-B a-Cu-O, in which the J(c) values show the secondary peak effect and high fi eld J(c) values are higher than those of Y-Ba-Cu-O. (C) 1999 Published by E lsevier Science S.A. All rights reserved.