Magnetic flux decoration of type-II superconductors

Grigorieva, I.V.

doi:10.1088/0953-2048/7/4/001

Cited by 47 publications

(37 citation statements)

References 60 publications

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“…Lett., which reported a paramagnetic Meissner effect, vortices carrying fractional flux, vortex configurations in confined geometries, and so on. My wife Irina Grigorieva, an expert in vortex physics, [9] could not find a job in the Netherlands and, therefore, had plenty of time to help me with conquering the subject and writing papers. Also, Sergey not only made the devices but also visited Nijmegen to help with measurements.…”

Section: Dutch Comfortmentioning

confidence: 99%

Random Walk to Graphene (Nobel Lecture)

2011

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There can be only one: In their Nobel Reviews, the laureates tell the story about the ever changing, exciting scientific pathways that eventually—for example, with the aid of simple adhesive tape—led them to the discovery of graphene. Graphene is a carbon monolayer with almost magical abilities, including exceptional strength, stability, and electronic properties, with massless Dirac fermions as charge carriers.

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Section: Dutch Comfortmentioning

confidence: 99%

Random Walk to Graphene (Nobel Lecture)

2011

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“…Clearly, the effect of vortex confinement in single crystal-based disks is very similar to that in individual thinfilm disks [5]. Indeed, previously confinement was found to have a mitigating effect on disorder in that, despite the presence of weak pinning, vortices formed nearly perfect shell configurations [5]; similarly, well-defined shell states are observed in weak-disorder disks on single crystals [e.g., state (1,6,13) in Fig. 1a].…”

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confidence: 92%

Pinning-Induced Formation of Vortex Clusters and Giant Vortices in Mesoscopic Superconducting Disks

et al. 2007

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Multi-quanta, or giant, vortices (GVs) are known to appear in very small superconductors near the superconducting transition due to strong confinement of magnetic flux. Here we present evidence for a new, pinning-related, mechanism for the formation of GVs. Using Bitter decoration to visualise vortices in small Nb disks, we show that confinement in combination with strong disorder causes individual vortices to merge into clusters or even GVs well below T c and H c2 , in contrast to well-defined shells of individual vortices found in the absence of pinning.Mesoscopic superconductors, i.e., such that they can accommodate only a small number of vortices, are known to exhibit complex and unique vortex structures due to the competition between surface superconductivity and vortex-vortex interactions [see e.g. 1-6]. For mesoscopic disks, theoretical studies found two kinds of superconducting states: a giant vortex (GV), i.e., a circular symmetric state with a fixed value of angular momentum that can carry several flux quanta [1,2] and multivortex states (MVS) with an effective total angular momentum corresponding to the number of vortices in the disk (vorticity L) [3]. Recently, it became possible to experimentally distinguish between a singlecore GV and a MVS composed of singly quantized vortices using the multiple-small-tunnel-junction

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“…These last extended defects are the signature of a vortex polycrystal with crystalline grains of different orientations. 14,16 Vortex polycrystals have been observed, after field cooling, in various superconducting materials such as NbMo, 14,16 NbSe 2 , [17][18][19][20] BSCCO, 21 and YBCO. 22 The grain size is typically found to grow with applied magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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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Magnetic flux decoration of type-II superconductors

Cited by 47 publications

References 60 publications

Random Walk to Graphene (Nobel Lecture)

Random Walk to Graphene (Nobel Lecture)

Pinning-Induced Formation of Vortex Clusters and Giant Vortices in Mesoscopic Superconducting Disks

Grain boundaries in vortex matter

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