Vortex trapping and expulsion in thin-film YBa2Cu3O7-d strips

K.H. Kuit, J.R. Kirtley, W. van der Veur, C.G. Molenaar, C.G. Molenaar, F.J.G. Roesthuis, A.G.P. Troeman, J.R. Clem, Johannes W.M. Hilgenkamp, Horst Rogalla, Jakob Flokstra

Research output: Contribution to journalArticleAcademicpeer-review

49 Citations (Scopus)
49 Downloads (Pure)

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.
Original languageUndefined
Pages (from-to)134504-
JournalPhysical review B: Condensed matter and materials physics
Volume77
Issue number13
DOIs
Publication statusPublished - 2008

Keywords

  • IR-59255
  • METIS-254353

Cite this

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