Vortex trapping and expulsion in thin-film YBa2Cu3O7−δ strips


Kuit, K.H. and Kirtley, J.R. and Veur, W. van der and Molenaar, C.G. and Roesthuis, F.J.G. and Troeman, A.G.P. and Clem, J.R. and Hilgenkamp, H. and Rogalla, H. and Flokstra, J. (2008) Vortex trapping and expulsion in thin-film YBa2Cu3O7−δ strips. Physical Review B: Condensed matter and materials physics, 77 (13). p. 134504. ISSN 1098-0121

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Abstract: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.
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Copyright:© 1992 American Physical Society
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Link to this item:http://purl.utwente.nl/publications/59255
Official URL:https://doi.org/10.1103/PhysRevB.77.134504
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