TITLE

Strong magnetic field dependence of the critical currents correlated to the microstructure of YBaCuO ceramics

AUTHOR(S)
Dai, Uri; Deutscher, Guy; Lacour, Claude; Laher-Lacour, Francine; Mocaër, Philippe; Laguës, Michel
PUB. DATE
March 1990
SOURCE
Applied Physics Letters;3/26/1990, Vol. 56 Issue 13, p1284
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Critical currents of YBaCuO ceramics were measured at 77 K by transport measurements in an applied magnetic field H. A hysteretic behavior between 10 and 10 000 G was observed. For decreasing fields, the critical current Jc obeys a power law H-n with n ranging between 0.6 and 2.8. The exponent n is correlated with the microstructure and the average grain size of the ceramic. This power law behavior is discussed in terms of modified flux creep and flux flow regimes related to the microstructure.
ACCESSION #
9833842

 

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