Thickness-modulated tungsten–carbon superconducting nanostructures grown by focused ion beam induced deposition for vortex pinning up to high magnetic fields

Serrano, Ismael G.; Sesé, J.; Guillamón, Isabel; Suderow, Hermann; Vieǐra, S.; Ibarra, M. R.

doi:10.3762/bjnano.7.162

Cited by 9 publications

(8 citation statements)

References 53 publications

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“…Using the model defined in Eq. (1), one can fit the linear current dependence of the V non-local, max /μ 0 H. It is remarkable that the linear dependence with the current starts from very low current values, indicating that in this field range, intrinsic pinning plays a minor role and the effect is governed by vortex viscosity 38 . The linear dependence exists up to J c (B), beyond which V non-local, max /μ 0 H starts to decrease.…”

Section: Resultsmentioning

confidence: 96%

Long-range vortex transfer in superconducting nanowires

Córdoba

Orús

Jelić

et al. 2019

Sci Rep

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Under high-enough values of perpendicularly-applied magnetic field and current, a type-II superconductor presents a finite resistance caused by the vortex motion driven by the Lorentz force. To recover the dissipation-free conduction state, strategies for minimizing vortex motion have been intensely studied in the last decades. However, the non-local vortex motion, arising in areas depleted of current, has been scarcely investigated despite its potential application for logic devices. Here, we propose a route to transfer vortices carried by non-local motion through long distances (up to 10 micrometers) in 50 nm-wide superconducting WC nanowires grown by Ga + Focused Ion Beam Induced Deposition. A giant non-local electrical resistance of 36 Ω has been measured at 2 K in 3 μm-long nanowires, which is 40 times higher than signals reported for wider wires of other superconductors. This giant effect is accounted for by the existence of a strong edge confinement potential that hampers transversal vortex displacements, allowing the long-range coherent displacement of a single vortex row along the superconducting channel. Experimental results are in good agreement with numerical simulations of vortex dynamics based on the time-dependent Ginzburg-Landau equations. Our results pave the way for future developments on information technologies built upon single vortex manipulation in nano-superconductors.

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Section: Resultsmentioning

confidence: 96%

Long-range vortex transfer in superconducting nanowires

Córdoba

Orús

Jelić

et al. 2019

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“…2(a), which corresponds to the quasistatic regime, one observes minima in the vortex-related mw excess loss at both matching fields for all mw power levels in the accessible range from -26 dBm to -3 dBm (2.5 µW to 0.5 mW). Such matching dips are typically seen in the field dependence of the electrical dc resistance [23,38] or in the ac susceptibility in the linear regime at low mw power levels [28,34,39].…”

Section: Resultsmentioning

confidence: 97%

“…In external magnetic fields, whose magnitude is between the lower and the upper critical field, these are penetrated by a lattice of Abrikosov vortices and the vortex dynamics determines their resistive response. In addition to two-dimensional structures fabricated by conventional thin films techniques, superconducting nanostructures can be fabricated by strain engineering [22] or directwrite techniques such as focused ion [15,21,23] and electron [16,17,24,25] beam-induced deposition. The latter technique is particularly suitable for the fabrication of three-dimensional structures and nano-architectures with non-trivial topology, such as a torus, a helix, a Möbius band and so on.…”

Section: Introductionmentioning

confidence: 99%

“…At

H_{m 2} = 9.6

mT one half of vortices is pinned at the groove bottoms while the rest are pinned between the grooves, so that this field value is referred to as a secondary matching field . The grooves are known to act as strong pinning sites for the vortex motion across them . Accordingly, the pinning of vortices is most efficient at

H_{m 1}

, less so at

H_{m 2}

and even less efficient at an arbitrary value of H between

H_{m 1}

and

H_{m 2}

, say

H = 8

mT for definiteness.…”

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confidence: 99%

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Reduction of Microwave Loss by Mobile Fluxons in Grooved Nb Films

Dobrovolskiy

Sachser

Bevz

et al. 2018

Physica Rapid Research Ltrs

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In the mixed state of type II superconductors penetrated by an external magnetic field in the form of a lattice of Abrikosov vortices, the dc resistance is known to increase with increasing velocity of the vortex lattice. Accordingly, vortex pinning sites impeding the vortex motion are widely used to preserve the low‐dissipative response of the system. Here, while subjecting superconducting Nb films with nanogrooves to a high‐frequency ac current stimulus and tuning the number of mobile and pinned vortices by varying the magnetic field around the so‐called matching values, we observe a completely opposite effect. Namely, the vortex‐related microwave excess loss for mobile vortices becomes smaller than for pinned vortices in a certain range of power levels at ac current frequencies above 100 MHz. Our findings appeal for the development of a theory of microwave‐stimulated superconductivity in the vortex state.

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“…In W-film-1, vortices get pinned by differences in the thickness of the thin film, as described in detail in Refs. [37,55]. In Figs.…”

Section: Appendixmentioning

confidence: 97%

Disordered hyperuniformity in superconducting vortex lattices

Llorens

Guillamón

Serrano

et al. 2020

Phys. Rev. Research

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The current carrying capability of type II superconductors under magnetic fields is determined to a large extent by the interaction of superconducting vortices with pinning centers. Vortices are arranged in lattices with varying degrees of disorder depending on the balance between the intervortex interactions and the pinning strength. We analyze here vortex arrangements in disordered vortex lattices of different superconducting systems, single crystals (Co-doped NbSe 2 , LiFeAs, and CaKFe 4 As 4), and amorphous W-based thin films (with critical temperatures T c from 4 K to 35 K and critical fields from 3.4 T to more than 90 T). We calculate for each case the structure factor and number variance and compare to calculations on an interacting set of partially pinned particles. We find that random density fluctuations appear when pinning overcomes interactions and show that the suppression of density fluctuations is correlated to the presence of interactions. We discuss the results within the framework of hyperuniform distributions and find that all studied lattices follow a similar increase of the number variance with the defect density.

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Thickness-modulated tungsten–carbon superconducting nanostructures grown by focused ion beam induced deposition for vortex pinning up to high magnetic fields

Cited by 9 publications

References 53 publications

Long-range vortex transfer in superconducting nanowires

Long-range vortex transfer in superconducting nanowires

Reduction of Microwave Loss by Mobile Fluxons in Grooved Nb Films

Disordered hyperuniformity in superconducting vortex lattices

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