We report on a study of vortex pinning in nanoscale antidot defect arrays in the context of the London theory. Using a wire network model, we discretize the array with a fine mesh, thereby providing a detailed treatment of pinning phenomena. The use of a fine grid has enabled us to examine both circular and elongated defects, patterned in the form of a rhombus. The latter display pinning characteristics superior to circular defects constructed with the similar area. We calculate pinning potentials for defects containing zero and single quanta, and we obtain a pinning phase diagram for the second matching field H=2Φo.
Physical Review B
- Pub Date:
- January 2002
- Theories and models of superconducting state;
- Defects and impurities: doping implantation distribution concentration etc.;
- Condensed Matter - Superconductivity
- 10 pages and 14 figures