Vortices in a wedge made of a type-I superconductor

Gladilin, V. N.; Ge, Jun‐Yi; Gutiérrez, J.; Timmermans, Matias; Vondel, J. Van de; Tempere, J.; Devreese, J. T.; Moshchalkov, Victor

doi:10.1088/1367-2630/17/6/063032

Cited by 12 publications

(11 citation statements)

References 21 publications

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“…For our values κ ≈ 0.2 × (1/ √ 2), clearly in the type-I regime. However, in the thin-film limit the penetration depth is renormalized such that κ = Λ/ξ [63,64], where Λ ∼ λ 2 /d.…”

Section: Appendix A: Estimating Bc1mentioning

confidence: 99%

Anomalous Fraunhofer interference in epitaxial superconductor-semiconductor Josephson junctions

et al. 2017

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We investigate patterns of critical current as a function of perpendicular and in-plane magnetic fields in superconductor-semiconductor-superconductor (SNS) junctions based on InAs/InGaAs heterostructures with an epitaxial Al layer. This material system is of interest due to its exceptionally good superconductor-semiconductor coupling, as well as large spin-orbit interaction and g-factor in the semiconductor. Thin epitaxial Al allows the application of large in-plane field without destroying superconductivity. For fields perpendicular to the junction, flux focusing results in aperiodic node spacings in the pattern of critical currents known as Fraunhofer patterns by analogy to the related interference effect in optics. Adding an in-plane field yields two further anomalies in the pattern. First, higher order nodes are systematically strengthened, indicating current flow along the edges of the device, as a result of confinement of Andreev states driven by an induced flux dipole; second, asymmetries in the interference appear that depend on the field direction and magnitude. A model is presented, showing good agreement with experiment, elucidating the roles of flux focusing, Zeeman and spin-orbit coupling, and disorder in producing these effects.

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Section: Appendix A: Estimating Bc1mentioning

confidence: 99%

Anomalous Fraunhofer interference in epitaxial superconductor-semiconductor Josephson junctions

et al. 2017

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“…An effectively two-dimensional TDGL equation for the order parameter ψ, normalized to 1 and averaged over the inhomogeneous thickness d(x,y) of the superconductor, can be written as [44,45] ∂ ∂t…”

Section: Time-dependent Ginzburg-landau Simulationsmentioning

confidence: 99%

Flux penetration in a superconducting film partially capped with a conducting layer

et al. 2017

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The influence of a conducting layer on the magnetic flux penetration in a superconducting Nb film is studied by magneto-optical imaging. The metallic layer partially covering the superconductor provides an additional velocity-dependent damping mechanism for the flux motion that helps to protect the superconducting state when thermomagnetic instabilities develop. If the flux advances with a velocity slower than w = 2/μ 0 σ t, where σ is the cap layer conductivity and t is its thickness, the flux penetration remains unaffected, whereas for incoming flux moving faster than w, the metallic layer becomes an active screening shield. When the metallic layer is replaced by a perfect conductor, it is expected that the flux braking effect will occur for all flux velocities. We investigate this effect by studying Nb samples with a thickness step. Some of the observed features, namely the deflection of the flux trajectories at the border of the thick center, as well as the favored flux penetration at the indentation, are reproduced by time-dependent Ginzburg-Landau simulations.

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“…These systems include, but are not limited to, multi-band superconductors or low-κ superconductors where core deformations at certain conditions, as described above, may lead to or enhance the intervortex attraction. One more interesting recent example of a physical system, that can be treated within our model, is a superconducting device that allows for the observation of the transition from type-II and type-I behavior, in one sample [52]. The sample has a shape of a superconducting wedge with a varying thickness that provides a smooth transition from the effective type-II superconductor (i.e., with κ ef f > 1/ √ 2) to the material with effective type-I parameters (κ ef f < 1/ √ 2).…”

Section: Attractive Component and Pinningmentioning

confidence: 99%

Pattern formation in vortex matter with pinning and frustrated intervortex interactions

2017

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We investigate the effects related to vortex core deformations when vortices approach each other.As a result of these vortex core deformations, the vortex-vortex interaction effectively acquires an attractive component leading to a variety of vortex patterns typical for systems with nonmonotonic repulsive-attractive interaction, such as stripes, labyrinths, etc. The core deformations are anisotropic and can induce frustration in the vortex-vortex interaction. In turn, this frustration has an impact on the resulting vortex patterns, which are analyzed in the presence of additional random pinning, as a function of the pinning strength. This analysis can be applicable to vortices in multiband superconductors or to vortices in Bose-Einstein condensates.

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Vortices in a wedge made of a type-I superconductor

Cited by 12 publications

References 21 publications

Anomalous Fraunhofer interference in epitaxial superconductor-semiconductor Josephson junctions

Anomalous Fraunhofer interference in epitaxial superconductor-semiconductor Josephson junctions

Flux penetration in a superconducting film partially capped with a conducting layer

Pattern formation in vortex matter with pinning and frustrated intervortex interactions

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