<i>In silico</i>
 optimization of critical currents in superconductors

Kimmel, Gregory J.; Sadovskyy, Ivan; Glatz, Andreas

doi:10.1103/physreve.96.013318

Cited by 16 publications

(20 citation statements)

References 36 publications

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“…24 Based on the simplified global parameter set, nearoptimal pinscapes can be fine-tuned using conventional optimization methods. 27 Furthermore, one can sample critical currents for near-optimal parameter sets to determine the robustness of the configuration, and compare them to analytical results. 15,[31][32][33][34] Stage 3: Verification.…”

Section: Targeted Evolutionmentioning

confidence: 99%

“…Only recently more systematic, computer-assisted approaches were developed, 24,25 leading to the critical-current-by-design methodology. 26 While sophisticated numerical optimization methods 27 and corresponding experiments can guide the design of superconductors with enhanced critical current densities, J c , the problem requires defining the general geometry of the vortex pinning landscape (or pinscape) a priori. Figure 1: Sketch of a targeted evolution of the pinning landscape.…”

Section: Introductionmentioning

confidence: 99%

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Targeted evolution of pinning landscapes for large superconducting critical currents

Sadovskyy

Koshelev

Kwok

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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The ability of type II superconductors to carry large amounts of current at high magnetic fields is a key requirement for future design innovations in high-field magnets for accelerators and compact fusion reactors, and largely depends on the vortex pinning landscape comprised of material defects. The complex interaction of vortices with defects that can be grown chemically, e.g., self-assembled nanoparticles and nanorods, or introduced by postsynthesis particle irradiation precludes a priori prediction of the critical current and can result in highly nontrivial effects on the critical current. Here, we borrow concepts from biological evolution to create a vortex pinning genome based on a genetic algorithm, naturally evolving the pinning landscape to accommodate vortex pinning and determine the best possible configuration of inclusions for two different scenarios: a natural evolution process initiating from a pristine system and one starting with preexisting defects to demonstrate the potential for a postprocessing approach to enhance critical currents. Furthermore, the presented approach is even more general and can be adapted to address various other targeted material optimization problems.

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Section: Targeted Evolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Targeted evolution of pinning landscapes for large superconducting critical currents

Sadovskyy

Koshelev

Kwok

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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“…It was found earlier that the optimal diameter of columnar defects is smaller than the optimal diameter of spherical defects by approximately one coherence length ξ. Since the optimal volume fraction f = 0.2 and diameter of defects d = 3ξ in both cases are similar, 39 we keep them constant in the following analysis, making the optimization problem manageable and effectively a two parameter optimization problem. Figure 1(b) demonstrates the dependency of the critical current on the distance with reduced defect density at the entrance l in and exit l out of vortices for a sample of width W = 64ξ.…”

Section: Resultsmentioning

confidence: 99%

Edge effect pinning in mesoscopic superconducting strips with non-uniform distribution of defects

Kimmel

Glatz

Vinokur

et al. 2019

Sci Rep

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Transport characteristics of nano-sized superconducting strips and bridges are determined by an intricate interplay of surface and bulk pinning. In the limiting case of a very narrow bridge, the critical current is mostly defined by its surface barrier, while in the opposite case of very wide strips it is dominated by its bulk pinning properties. Here we present a detailed study of the intermediate regime, where the critical current is determined, both, by randomly placed pinning centres and by the Bean-Livingston barrier at the edge of the superconducting strip in an external magnetic field. We use the time-dependent Ginzburg-Landau equations to describe the vortex dynamics and current distribution in the critical regime. Our studies reveal that while the bulk defects arrest vortex motion away from the edges, defects in their close vicinity promote vortex penetration, thus suppressing the critical current. We determine the spatial distribution of the defects optimizing the critical current and find that it is in general non-uniform and asymmetric: the barrier at the vortex-exit edge influence the critical current much stronger than the vortex-entrance edge. Furthermore, this optimized defect distribution has a more than 30% higher critical current density than a homogeneously disorder superconducting film.

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“…Shallow peak both in Jc(B) and angular dependence of B. Shallow peak in Jc(f) and Jc(d) [59,65] Randomly placed spheroids || B and ⟂ J…”

Section: Robustness Of the Optimal Configurationmentioning

confidence: 99%

The Quest for High Critical Current in Applied High-Temperature Superconductors

Glatz

Sadovskyy

Welp

et al. 2019

J Supercond Nov Magn

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We present a perspective on a new critical-current-by-design paradigm to tailor and enhance the current-carrying capacity of applied superconductors. Critical current by design is based on large-scale simulations of vortex matter pinning in high-temperature superconductors and has qualitative and quantitative predictive powers to elucidate vortex dynamics under realistic conditions and to propose vortex pinning defects that could enhance the critical current, particularly at high magnetic fields. The simulations are validated with controlled experiments and demonstrate a powerful tool for designing highperformance superconductors for targeted applications.

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In silico optimization of critical currents in superconductors

Cited by 16 publications

References 36 publications

Targeted evolution of pinning landscapes for large superconducting critical currents

Targeted evolution of pinning landscapes for large superconducting critical currents

Edge effect pinning in mesoscopic superconducting strips with non-uniform distribution of defects

The Quest for High Critical Current in Applied High-Temperature Superconductors

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