Lf. Cohen et al., DETAILED MAGNETIC-RELAXATION MEASUREMENTS OF (Y,TM)BA2CU3O7-DELTA CRYSTALS - IMPLICATIONS FOR THE H-T DIAGRAM, Physica. C, Superconductivity, 230(1-2), 1994, pp. 1-8
By collating vortex relaxation data for a number of high-quality (Y, T
m)Ba2Cu3O7-delta crystals, several different regions of the H-T plane
can be mapped out quantitatively, and without resort to fitting parame
ters. The features discussed are universal to all samples studied, and
the crossovers between the regions can be understood in terms of dyna
mic transitions in the vortex behaviour. The relaxation information tr
anslates into an electric field-current picture, where different regio
ns of the E-J curve are probed using two complementary relaxation tech
niques.