Flux-charge analogy and nonlinear response function in HTSC and 2D charge systems

Abstract The physics of flux lines in HTSC pinned by strongly correlated defects can be mapped onto charges in two dimensions (2D). Considering the viscous dissipation of moving vortices during hopping, we find a nonlinear response function. This function is compatible with so far suggested different model barriers U ( J ) and able to make a consistent description of the vortex system near transition. A comparison with the scaling behavior of the measured isothermal current-voltage curves with YBCO samples shows fair agreement. This nonlinear response function also shows an empirical fit with I–V behavior of some 2D charge systems.