Pillars as antipinning centers in superconducting films

Golibjon Berdiyorov, V. R. Misko, M. V. Milošević, W. Escoffier, I. V. Grigorieva, F. M. Peeters

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Using the nonlinear Ginzburg-Landau theory we study vortex configurations in a superconducting thin film with a square array of pillars in the presence of a uniform applied magnetic field. The presence of the pillars changes the vortex structures in the superconducting film considerably: a transition between triangular and square vortex lattices takes place with increasing size and/or height of the pillars and vortex lines and vortex clusters can be obtained for particular applied magnetic fields. All of these findings are summarized into an equilibrium vortex phase diagram, which shows the transition between different ground-state vortex configurations as a function of the radius and periodicity of pillars. For larger radius of the pillars vortices start to penetrate the pillars and order in vortex shell structures both inside and around the pillars. The theoretical results are complemented by an experimental study of the vortex configurations in single-crystal based Nb pillars with radius R∼0.5-2 μm. Using Bitter decoration, concentric shells of vortices are revealed inside the pillars and shell-like structures are found at the interstitial sites, in accordance with the theoretical results. In addition, the observed distortion of the vortex shell structures by weak pinning centers present in our Nb samples is investigated by molecular dynamics simulations. We also show that the transition between predicted vortex states can be obtained from the temperature dependence of local magnetization measurements.

Original languageEnglish
Article number024526
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number2
DOIs
Publication statusPublished - 28 Jan 2008
Externally publishedYes

Fingerprint

Superconducting films
superconducting films
Vortex flow
vortices
radii
configurations
Magnetic fields
Electron transitions
magnetic fields
Ground state
Phase diagrams
Molecular dynamics
periodic variations
Magnetization
interstitials

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Berdiyorov, G., Misko, V. R., Milošević, M. V., Escoffier, W., Grigorieva, I. V., & Peeters, F. M. (2008). Pillars as antipinning centers in superconducting films. Physical Review B - Condensed Matter and Materials Physics, 77(2), [024526]. https://doi.org/10.1103/PhysRevB.77.024526

Pillars as antipinning centers in superconducting films. / Berdiyorov, Golibjon; Misko, V. R.; Milošević, M. V.; Escoffier, W.; Grigorieva, I. V.; Peeters, F. M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 77, No. 2, 024526, 28.01.2008.

Research output: Contribution to journalArticle

Berdiyorov, Golibjon ; Misko, V. R. ; Milošević, M. V. ; Escoffier, W. ; Grigorieva, I. V. ; Peeters, F. M. / Pillars as antipinning centers in superconducting films. In: Physical Review B - Condensed Matter and Materials Physics. 2008 ; Vol. 77, No. 2.
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