Critical Scaling of Extended Power Law I-V Isotherms near Vortex Glass Transition

摘要

In view of the question about the vortex glass theory of the freezing ofdisordered vortex matter raised by recent experimental observations wereinvestigate the critical scaling of high $T_c$ superconductors. We find thatdc current-voltage characteristic of mixed state superconductors has thegeneral form of extended power law which is based on the Ginzburg-Landau (GL)functional in the similar way as the vortex glass theory. Isotherms simulatedfrom this nonlinear equation fit the experimental I-V data of Strachan etal.[Phys.Rev.Lett. 87, 067007 (2001)]. The puzzling question of the derivativeplot for the I-V curves and the controversy surrounding the values of criticalexponents are also discussed.