Commensurability effects induced by a periodic array of nanoscale anti-dots in Nb superconductor

Zhukov, A. A.; Filby, E.T.; Groot, P.A.J. de; Metlushko, V.; Ilić, B.

doi:10.1016/j.physc.2003.11.048

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…In the final stage of preparing this manuscript, we learned about a recent report by Zhukov et al 38 showing several results in agreement with the present work.…”

Section: Influence Of the Periodic Pinningsupporting

confidence: 88%

Paramagnetic reentrance ofacscreening: Evidence of vortex avalanches inPbthin films

2004

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We have studied the influence of a square array of pinning centers on the dynamics of vortex avalanches in Pb thin films by means of ac-and dc-magnetization measurements. Close to the superconducting transition T c , the commensurability between the vortex lattice and the pinning array leads to the well known local increments of the critical current. As temperature T decreases, matching features progressively fade out and eventually disappear. Further down in temperature, vortex avalanches develop and dominate the magnetic response. These avalanches manifest themselves as jumps in the dc magnetization and produce a lower ac shielding, giving rise to a paramagnetic reentrance in the ac screening Ј͑T͒. Within the flux-jump regime, two subregimes can be identified. Close to the boundary where vortex avalanches develop, the field separation between consecutive jumps follows the periodicity of the pinning array and a field-and temperature-dependent screening is observed. In this regime, the response also depends on frequency f in agreement with theoretical models for magnetothermal instabilities. At low enough temperatures and fields, the screening saturates to a constant value independent of T, H, and f, where jumps are randomly distributed. We have also found that vortex instabilities occupy a larger portion of the H-T diagram in patterned samples than in films without nanoengineered pinning sites. Finally, we discuss the possible origin of the vortex avalanches and compare our results with previous experimental and theoretical studies.

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“…In the final stage of preparing this manuscript, we learned about a recent report by Zhukov et al 38 showing several results in agreement with the present work.…”

Section: Influence Of the Periodic Pinningsupporting

confidence: 88%

Paramagnetic reentrance ofacscreening: Evidence of vortex avalanches inPbthin films

2004

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“…The interaction between elastic media and periodic pinning potentials [1] is present in many well-known systems as for example charge and spin density waves, absorbed atomic layers in periodic substrates and superconducting vortices in samples with artificial periodic pinning centers. This last system is particularly convenient for studying these interactions because the relative spacing between vortices and pinning sites can be easily varied by changing the magnitude of the applied magnetic field.…”

Section: Introductionmentioning

confidence: 99%