Fig. 1
From: Accelerated vortex dynamics across the magnetic 3D-to-2D crossover in disordered superconductors
Correlation volumes in different pinning scenarios. Illustration of pinning volumes for the single vortex, vortex bundle, and mixed pinning regime (from left to right). The volume Vc = \(L_{\mathrm{c}}R_{\mathrm{c}}^2\) (indicated by a dashed ellipsoid) contains many point defects (red) and/or few large inclusions (yellow) and determines the creep rate. The bottom row indicates the situation where Lc is truncated by the sample thickness d. The description of pinning in systems with heterogeneous defects poses an unsolved problem
