Abstract
We study the critical depinning current versus the applied magnetic flux , for quasiperiodic (QP) chains and 2D arrays of pinning centers placed on the nodes of a fivefold Penrose lattice. In QP chains, the peaks in are determined by a sequence of harmonics of the long and short segments of the chain. The critical current has a remarkable self-similarity. In 2D QP pinning arrays, we predict analytically and numerically the main features of , and demonstrate that the Penrose lattice of pinning sites provides an enormous enhancement of , even compared to triangular and random pinning site arrays. This huge increase in could be useful for applications.
- Received 1 January 2005
DOI:https://doi.org/10.1103/PhysRevLett.95.177007
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