Growth of a Vortex Polycrystal in Type II Superconductors

Moretti, Paolo; Miguel, M. Carmen; Zaiser, Michael; Zapperi, Stefano

doi:10.1103/physrevlett.92.257004

Cited by 15 publications

(22 citation statements)

References 27 publications

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“…2͒, in qualitative agreement with experimental results 16 and the theoretical predictions reported in Ref. 40.…”

Section: The Effect Of Grain Boundaries On the Critical Currentsupporting

confidence: 91%

“…͑24͒ for the weak-pinning regime, yielding R g ϰ R a . A similar calculation can be performed in the strong-pinning regime 40 and the results appear to be in good agreement with experiments measuring average grain sizes in NbMo. 16 …”

Section: Grain Growthsupporting

confidence: 82%

“…These results are important to quantify arrested grain growth due to disorder and can be used to estimate the grain size in field-cooling experiments. 40 An important question concerns the relevance of a polycrystalline vortex structure for the transport properties of a superconductor. 20 We have shown by numerical simulations that the critical current of a vortex polycrystal is systematically higher than the one observed in the corresponding single-crystal case.…”

Section: Discussionmentioning

confidence: 99%

“…Thus to understand the properties of vortex polycrystals, it is important to analyze the dynamics of grain boundaries in vortex matter as they interact with disorder. 40 Grain growth is driven by a reduction in energy. For an average grain size R and straight grain boundaries, the characteristic energy stored per unit volume in the form of grain boundary dislocations is of the order of ⌫ 0 / R, where ⌫ 0 is the energy per unit area of a grain boundary.…”

Section: Grain Growthmentioning

confidence: 99%

“…Using scaling arguments, we also derive the creep law for thermally activated motion and discuss disorder-arrested grain growth. 40 The critical current is an important property of type-II superconductors, since it represents the current below which vortices are pinned and the material conducts without resistance. It is thus interesting to understand how the topological properties of vortex matter influence its behavior.…”

Section: Introductionmentioning

confidence: 99%

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Grain boundaries in vortex matter

2005

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We explore the statistical properties of grain boundaries in the vortex polycrystalline phase of type-II superconductors. Treating grain boundaries as arrays of dislocations interacting through linear elasticity, we show that self-interaction of a deformed grain boundary is equivalent to a nonlocal long-range surface tension. This affects the pinning properties of grain boundaries, which are found to be less rough than isolated dislocations. The presence of grain boundaries has an important effect on the transport properties of type-II superconductors as we show by numerical simulations: our results indicate that the critical current is higher for a vortex polycrystal than for a regular vortex lattice. Finally, we discuss the possible role of grain boundaries in vortex lattice melting. Through a phenomenological theory we show that melting can be preceded by an intermediate polycrystalline phase.

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“…2͒, in qualitative agreement with experimental results 16 and the theoretical predictions reported in Ref. 40.…”

Section: The Effect Of Grain Boundaries On the Critical Currentsupporting

confidence: 91%

Section: Grain Growthsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Grain Growthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Grain boundaries in vortex matter

2005

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Jamming and Yielding of Dislocations: from Crystal Plasticity to Superconducting Vortex Flow

Zapperi

Miguel

Moretti

et al.

Jamming, Yielding, and Irreversible Deformation in Condensed Matter

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Viscoelastic Interfaces Driven in Disordered Media

Landes

2016

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Growth of a Vortex Polycrystal in Type II Superconductors

Cited by 15 publications

References 27 publications

Grain boundaries in vortex matter

Grain boundaries in vortex matter

Jamming and Yielding of Dislocations: from Crystal Plasticity to Superconducting Vortex Flow

Viscoelastic Interfaces Driven in Disordered Media

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