A scanning superconducting quantum interference device microscope was used to image vortex trapping asa function of the magnetic induction during cooling in thin-film YBa2Cu3O7-δ (YBCO) strips for strip widths W from 2 to 50 m. We found that vortices were excluded from the strips when the induction Ba was below a critical induction Bc. We present a simple model for the vortex exclusion process which takes into account the vortex-antivortex pair production energy as well as the vortex Meissner and self-energies. This model predicts that the real density n of trapped vortices is given by n=BaâBK /0 with BK=1.650 /W2 and 0=h/2e the superconducting flux quantum. This prediction is in good agreement with our experiments on YBCO, as well as with previous experiments on thin-film strips of niobium. We also report on the positions of the trapped vortices. We found that at low densities the vortices were trapped in a single row near the centers of the strips, with the relative intervortex spacing distribution width decreasing as the vortex density increased, a sign of longitudinal ordering. The critical induction for two rows forming in the 35 m wide strip was 2.89+1.91 0.93Bc, consistent with a numerical prediction.
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 2008|
Kuit, K. H., Kirtley, J. R., van der Veur, W., Molenaar, C. G., Molenaar, C. G., Roesthuis, F. J. G., ... Flokstra, J. (2008). Vortex trapping and expulsion in thin-film YBa2Cu3O7-d strips. Physical review B: Condensed matter and materials physics, 77(13), 134504-. https://doi.org/10.1103/PhysRevB.77.134504