Superficial Periodic Pinning Induced by Bitter Decoration Applied to the Study of Vortex Structure Nucleation and Growth

Fasano, Yanina; Herbsommer, Juan A.; Cruz, F. de la

doi:10.1002/(sici)1521-3951(199909)215:1<563::aid-pssb563>3.0.co;2-c

Cited by 25 publications

(34 citation statements)

References 15 publications

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“…We image individual vortex positions in a typical fieldof-view of thousands of vortices by performing magnetic decoration experiments at 4.2 K after field cooling at different applied fields in the range 5 < H < 150 Oe. Vortices are decorated with Fe particles attracted by the local field gradient generated around the vortex cores [24], observed as black dots in the inverted scanning-electronmicroscopy images of Fig. 4.…”

Section: Density Fluctuations: Experimental Resultsmentioning

confidence: 99%

Hyperuniform vortex patterns at the surface of type-II superconductors

Rumi

Sánchez

Elías

et al. 2019

Phys. Rev. Research

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A many-particle system must posses long-range interactions in order to be hyperuniform at thermal equilibrium. Hydrodynamic arguments and numerical simulations show, nevertheless, that a three-dimensional elastic-line array with short-ranged repulsive interactions, such as vortex matter in a type-II superconductor, forms at equilibrium a class-II hyperuniform two-dimensional point pattern for any constant-z cross section. In this case, density fluctuations vanish isotropically as ∼ q α at small wave-vectors q, with α = 1. This prediction includes the solid and liquid vortex phases in the ideal clean case, and the liquid in presence of weak uncorrelated disorder. We also show that the three-dimensional Bragg glass phase is marginally hyperuniform, while the Bose glass and the liquid phase with correlated disorder are expected to be non-hyperuniform at equilibrium. Furthermore, we compare these predictions with experimental results on the large-wavelength vortex density fluctuations of magnetically decorated vortex structures nucleated in pristine, electron-irradiated and heavy-ion irradiated superconducting Bi2Sr2CaCu2O 8+δ samples in the mixed state. For most cases we find hyperuniform two-dimensional point patterns at the superconductor surface with an effective exponent α eff ≈ 1. We interpret these results in terms of a large-scale memory of the high-temperature line-liquid phase retained in the glassy dynamics when field-cooling the vortex structures into the solid phase. We also discuss the crossovers expected from the dispersivity of the elastic constants at intermediate length-scales, and the lack of hyperuniformity in the xy plane for lengths q −1 larger than the sample thickness due to finite-size effects in the z-direction. We argue these predictions may be observable and propose further imaging experiments to test them independently.arXiv:1907.00394v1 [cond-mat.dis-nn]

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Section: Density Fluctuations: Experimental Resultsmentioning

confidence: 99%

Hyperuniform vortex patterns at the surface of type-II superconductors

Rumi

Sánchez

Elías

et al. 2019

Phys. Rev. Research

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“…2 While intrinsic pinning due to impurities and crystalline defects is always present in real samples, in the last years several techniques have been implemented to artificially create pinning centers with different topologies and spatial distributions. [3][4][5][6][7][8] Theoretical studies and simulations involving periodic or disordered pinning have been performed. [9][10][11][12][13][14] To our knowledge the interplay between these two types of pinning has not been addressed in detail.…”

Section: Introductionmentioning

confidence: 99%

Vortices in artificial potentials: Simulations of double bitter decorations

2002

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We model the behavior of a vortex system in the presence of two types of pinning forces. One is caused by a dense point disorder. The other is the artificial Bitter pinning introduced by means of a magnetic decoration. We study static and dynamical properties of the system as a function of the vortex density, the temperature, and the relative intensity of the pinning forces. We find different dynamical behaviors near the solid-liquid transition. Our numerically obtained double decoration patterns are very similar to the ones observed experimentally.

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“…We have direct access to the static arXiv:1704.01040v1 [cond-mat.supr-con] 4 Apr 2017 structural properties with single-vortex resolution. 27 We present a systematic study as a function of the number of vortices in the nanocrystal, tuned either by sample physical size or vortex density.…”

Section: Introductionmentioning

confidence: 99%

Excess of topological defects induced by confinement in vortex nanocrystals

et al. 2017

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We directly image individual vortex positions in nanocrystals in order to unveil the structural property that contributes to the depletion of the entropy-jump entailed at the first-order transition. On reducing the nanocrystal size the density of topological defects increases near the edges over a characteristic length. Within this "healing-length" distance from the sample edge vortex rows tend to bend while towards the center of the sample the positional order of the vortex structure is what is expected for the Bragg-glass phase. This suggests that the healing-length may be a key quantity to model the entropy-jump depletion in the first-order transition of extremely-layered vortex nanocrystals.

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Superficial Periodic Pinning Induced by Bitter Decoration Applied to the Study of Vortex Structure Nucleation and Growth

Cited by 25 publications

References 15 publications

Hyperuniform vortex patterns at the surface of type-II superconductors

Hyperuniform vortex patterns at the surface of type-II superconductors

Vortices in artificial potentials: Simulations of double bitter decorations

Excess of topological defects induced by confinement in vortex nanocrystals

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