We report the importance of the induction planar component Bx in the relaxation of the remanent state in thin superconducting samples. Analysis based on the one-dimensional rate equation for thermally activated flux motion, which considers only the normal component Bz, yields unphysical divergence of the average flux line velocity as the neutral line is approached. Two-dimensional analysis resolves this problem and yields a modified scenario for the flux creep process in which vortex bending and the neutral line play a major role. These results are demonstrated in analysis of the local relaxation data obtained from a thin Nd1.85Ce0.15CuO4-δ crystal in the remanent state.
Bibliographical noteFunding Information:
This work was supported by the USA–Israel Binational Science Foundation, by the Heinrich Hertz Minerva Center, and by the Israel Science Foundation.
- Magnetic relaxation
- Neutral line