Abstract: The superconductor sample had periodic distribution of pinned region (with length of L_p) and unpinned region (with length of L−L_p) along the driving force direction. Numerical study on the influence of the distribution of pinning centers on pinning of the two-dimensional vortex system showed that the critical depinning force F_c, beyond which the vortex system begins to depin,increases with increase of L_p, indicating that the homogeneity of pinning centers helps to enhance the critical electric current of a superconductor. We found that the critical depinning force F_c depends logarithmically on L/L_p.

Key words: superconductor,vortex lattice,pinning,critical force

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