The study of electric field distributions induced by flux creep in type-II superconducting films allows for important insight into the mechanism of vortex dynamics, the temporal evolution of flux and current distributions, and the occurrence of local losses. Most studies are based on the assumption that a phenomenological materials law, which has been extracted from macroscopic transport measurements, can be also applied to the local electric field during magnetization decay. We evaluate this ansatz by reconstructing the three-dimensional-induced ${\mathbf{E}}_i$ and potential ${\mathbf{E}}_p$ electric fields from experimentally measured time dependence of the flux density distribution. The results are quantitatively compared with solutions of the nonlinear and nonlocal equation of motion for the flux penetration, where the Maxwell equations as well as a materials law are utilized to obtain a two-dimensional ${\mathbf{E}}_{i,2\text{D}}$ and ${\mathbf{E}}_{p,2\text{D}}$. We focus our analysis on the electric field distributions on a partially penetrated magnetized state of an epitaxial ${\text{YBa}}_2{\text{Cu}}_3{\text{O}}_{6.95}$ film.

• Received 24 November 2009

DOI:https://doi.org/10.1103/PhysRevB.81.144506