Symmetry Locking and Commensurate Vortex Domain Formation in Periodic Pinning Arrays

Grigorenko, A. N.; Bending, S. J.; Bael, M. J. Van; Lange, M.; Moshchalkov, Victor; Fangohr, Hans; Groot, P.A.J. de

doi:10.1103/physrevlett.90.237001

Cited by 73 publications

(50 citation statements)

References 20 publications

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“…The latter in particular reveal the formation of fractional matching states. As it was argued in many works the vortex configuration at fractional matching fields are characterized by striking domain structure and associated grain boundaries [33,34]. The presence of multiple degenerate states with domain formation at the fractional field, directly observed with scanning Hall probe microscopy [33], seems to be high probable in our films.…”

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confidence: 69%

Evidence of fractional matching states in nanoperforated Nb thin film grown on porous silicon

Trezza¹,

Cirillo²,

Prischepa³

et al. 2009

Europhys. Lett.

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Abstract. -Resistive transitions have been measured on a perforated Nb thin film with a lattice of holes with the period of the order of ten nanometers. Bumps in the dR/dH versus H curves have been observed at the first matching field and its fractional values, 1/4, 1/9 and 1/16. This effect has been related to different vortex lattice configurations made available by the underlying lattice of holes.

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mentioning

confidence: 69%

Evidence of fractional matching states in nanoperforated Nb thin film grown on porous silicon

Trezza¹,

Cirillo²,

Prischepa³

et al. 2009

Europhys. Lett.

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“…1(d)] most of the extra vortices (∼H − H 1 ) lead to double occupancy (2 0 ) of some pinning sites instead of sitting at interstitial positions. [13][14][15] Owing to the repulsive vortex-vortex interaction, double-quantized vortices avoid being located at neighboring holes. Interestingly, doublequantized vortices also avoid sitting at the row of antidots adjacent to the sample's border.…”

Section: Equilibrium Vortex Distributionmentioning

confidence: 99%

Microscopic picture of the critical state in a superconductor with a periodic array of antidots

et al. 2011

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By using scanning Hall microscopy we visualize the progressive formation of the critical state with individual vortex resolution in a Pb thin film with a periodic pinning array. Slightly above the first penetration field, we directly observe a terraced critical state as proposed theoretically by Cooley and Grishin [Phys. Rev. Lett. 74, 2788 (1995)]. However, at higher fields, the flux front tends to disorder and the classical Bean profile is restored. This study allows us to establish a clear link between the widely used integrated response measurements in the superconducting state and the nanoscale landscape defined by individual vortices.

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“…However, the commensurate vortex distributions at fractional matching fields present a considerable amount of structural defects, possibly reminiscent of domain formation. 41,42 Just above the first matching field, the first interstitial vortices appear while upon further increasing the dc field a combination of interstitial and double quantized vortices (at the pinning sites) is established. This suggests that the saturation number n s of the antidots at the freezing temperature is 1 < n s < 2.…”

Section: Scanning Hall Probe Experiments a Sample Layout And Eqmentioning

confidence: 99%

Probing the low-frequency vortex dynamics in a nanostructured superconducting strip

et al. 2016

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We investigate by scanning susceptibility microscopy the response of a thin Pb strip, with a square array of submicron antidots, to a low-frequency ac magnetic field applied perpendicularly to the film plane. By mapping the local permeability of the sample within the field range where vortices trapped by the antidots and interstitial vortices coexist, we observed two distinct dynamical regimes occurring at different temperatures. At a temperature just below the superconducting transition, T /Tc = 0.96, the sample response is essentially dominated by the motion of highly mobile interstitial vortices. However, at a slightly lower temperature, T /Tc = 0.93, the interstitial vortices freeze up leading to a strong reduction of the ac screening length. We propose a simple model for the vortex response in this system which fits well to the experimental data. Our analysis suggests that the observed switching to the high mobility regime stems from a resonant effect, where the period of the ac excitation is just large enough to allow interstitial vortices to thermally hop through the weak pinning landscape produced by random material defects. This argument is further supported by the observation of a pronounced enhancement of the out-of-phase response at the crossover between both dynamical regimes.

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Symmetry Locking and Commensurate Vortex Domain Formation in Periodic Pinning Arrays

Cited by 73 publications

References 20 publications

Evidence of fractional matching states in nanoperforated Nb thin film grown on porous silicon

Evidence of fractional matching states in nanoperforated Nb thin film grown on porous silicon

Microscopic picture of the critical state in a superconductor with a periodic array of antidots

Probing the low-frequency vortex dynamics in a nanostructured superconducting strip

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