Vortex trapping is investigated in thin-film strips of superconducting material. We present a model for the critical field above which vortex trapping occurs in these strips. This model includes the pairing energy of vortex-antivortex pairs in addition to the energy of single vortices. Experimental verification of the model with a scanning SQUID microscope shows very good agreement between the model and experiments on YBa2Cu3O7-delta and Nb strips. Statistical analysis of the vortex distribution in the strips above the critical field has been performed and a comparison has been made between Nb and YBa2Cu3O7-delta for the distributions in the lateral and longitudinal directions.
- yttrium compounds
- high-temperature superconductors
- superconducting thin films
- type II superconductors
- Barium compounds
Kuit, K. H., Kirtley, J. R., Clem, J. R., Rogalla, H., & Flokstra, J. (2009). Vortex Trapping an Expulsion in Thin-Film Type-II Supercondu cting Strips. IEEE transactions on applied superconductivity, 19(3), 3537-. https://doi.org/10.1109/TASC.2009.2018080