Importance of the crossover-current density for a vortex-glass analysis

Recent experimental results obtained from transport measurements on extreme ly long measurement bridges [1] have questioned the validity of previous vo rtex-glass analyses. For electric-held windows restricted to relatively hig h values of E > 10(-5) V/m the dynamic exponent of the vortex-glass transit ion z approximate to 6, in agreement with theoretical predictions and previ ous experimental results. However, for extended windows (10(-1) greater tha n or equal to E greater than or equal to 10(-8) V/m) - while the characteri stics of a vortex-glass transition are preserved - all analyses result in z greater than or equal to 9. A combined analysis of the crossover-current d ensity J(0)(+) and crossover-electric field E-0(+), which limit the critica l regime of the vortex-glass transition, allows a conclusive determination of z depending primarily on higher electric-field data.