Temperature dependent pinning phenomenon in superconducting Nb films with triangular and honeycomb pinning arrays

R. Cao, Lance Horng, T. C. Wu, J. C. Wu, T. J. Yang

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The pinning phenomena in superconducting Nb films with triangular and honeycomb pinning arrays were explored. Special temperature dependent phenomena were found for both films. For the film with a triangular pinning array, the pronounced matching peaks in the critical currents as a function of magnetic field reduce from six to three within a narrow temperature range. This temperature dependent matching effect is explained by considering the dramatic change of coherent length with temperature when the temperature is close to Tc. In order to compare with the film with a triangular pinning array, we fabricated a film with a honeycomb pinning array with similar pinning site spacing and pinning size. Special prominent matching peaks at H = 3.5H 1 were found for this film. Molecular dynamic simulations were made to study this phenomenon. The ground state distribution of vortices obtained from simulations reasonably explains the prominent matching peaks. Pronounced temperature dependent matching effects were also found for the film with a honeycomb pinning array.

Original languageEnglish
Article number075705
JournalJournal of Physics Condensed Matter
Volume21
Issue number7
DOIs
Publication statusPublished - 2009 Apr 9

Fingerprint

Superconducting films
superconducting films
Temperature
temperature
Critical currents
Ground state
Molecular dynamics
Vortex flow
Magnetic fields
critical current
simulation
spacing
Computer simulation
vortices
molecular dynamics
ground state
magnetic fields

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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Temperature dependent pinning phenomenon in superconducting Nb films with triangular and honeycomb pinning arrays. / Cao, R.; Horng, Lance; Wu, T. C.; Wu, J. C.; Yang, T. J.

In: Journal of Physics Condensed Matter, Vol. 21, No. 7, 075705, 09.04.2009.

Research output: Contribution to journalArticle

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