Anisotropic superconductors in tilted magnetic fields

Vlasko-Vlasov, Vitalii; Glatz, Andreas; Koshelev, A. E.; Welp, U.; Kwok, W. K.

doi:10.1103/physrevb.91.224505

Cited by 13 publications

(9 citation statements)

References 46 publications

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“…According to our earlier observations in YBCO crystals [2] and simulations using Ginzburg-Landau formalism [25][26], the vortex crossing in the presence of pinning can effectively delay the vortex motion. Therefore, the crossing-reconnection effects, which in this case occur in the thicker film, should delay the motion of normal B ⊥ vortices moving across the H || direction, while their motion along H || should not be impeded by the vortex crossing.…”

Section: (B) Vortex Cutting In Crossing Fieldsmentioning

confidence: 82%

“…Also, the crossing-reconnection process is not well understood even for vortices in bulk superconductors [1]. Albeit, our recent simulations show [25,26] that the vortex cutting can effectively delay the penetration of crossing vortices into the sample. Previous reports of crossing-fields in thin YBCO plates [2,3], and the anisotropy of the vortex dynamics in the thicker Nb film can be an experimental confirmation of this conjecture.…”

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confidence: 83%

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Crossing fields in thin films of isotropic superconductors

et al. 2016

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We study interactions of perpendicular and longitudinal magnetic fields in niobium films of different thickness in a wide range of temperatures below the superconducting transition temperature (T C ) . In 100 nm Nb film at all temperatures the longitudinal field H || practically does not influence the dynamics of the normal flux. However, in 200nm Nb film, a considerable anisotropy in the vortex motion is found with advanced propagation of the normal flux along H || at T>T C /2 and the preferential jump-wise growth of the thermomagnetic flux dendrites across H || at T

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Section: (B) Vortex Cutting In Crossing Fieldsmentioning

confidence: 82%

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confidence: 83%

Crossing fields in thin films of isotropic superconductors

et al. 2016

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“…In the cuprates, tilted fields create arrangements of crossing pancake and Josephson vortex lattices whose structure strongly depends on the temperature, magnetic field and tilt [31][32][33][34] . Lattices of pancake vortices slightly shifted between layers can appear under some conditions, leading in essence to tilted lines of vortices that are expected to exit at an angle to the surface 21,[35][36][37] .…”

Section: Discussionmentioning

confidence: 99%

Tilted vortex cores and superconducting gap anisotropy in 2H-NbSe2

et al. 2018

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The superconductor 2H-NbSe 2 features vortices with a sixfold star shape when the magnetic field is applied perpendicular to the plane of the hexagonal crystal structure. This is due to the anisotropy in the quasi-two-dimensional Fermi surface tubes oriented along the c axis. But the properties of another, three-dimensional, pocket are unknown, in spite that it has a dominant contribution in many experiments. Here we measure vortices in tilted magnetic fields using a scanning tunneling microscope. We find patterns of stripes due to in-plane vortices and show how these change with the in-plane direction of the magnetic field. The shape of outgoing vortices is successfully compared with detailed calculations of vortex cores. Our data show that vortices exit at an angle with the surface and that the sixfold gap anisotropy is present over the whole Fermi surface.

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“…This may be an event where one vortex can be interpreted as moving through the other (cutting, crossing, and then reconnecting) or an event where the two vortices swap parts when they touch (recombination, as observed in Refs. [8][9][10]). Both events will appear as a merge followed by a split.…”

Section: Interpreting Events From Analysis Of the Space-time Vortmentioning

confidence: 99%

“…Recently, to study the collective dynamics of many vortices, researchers have begun conducting large, computationally intensive 3D simulations where macroscale phenomena can be observed [6,7]. These simulation have been used to examine the dynamics of flux cutting, where two vortices move through each other [8][9][10], to study the impact of distri-butions of defects, and to optimize the pinning of vortices by spherical nano particles [11].…”

Section: Introductionmentioning

confidence: 99%

Tracking vortices in superconductors: Extracting singularities from a discretized complex scalar field evolving in time

et al. 2016

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In type-II superconductors, the dynamics of magnetic flux vortices determine their transport properties. In the Ginzburg-Landau theory, vortices correspond to topological defects in the complex order parameter field. Earlier, in Phillips et al. [Phys. Rev. E 91, 023311 (2015)], we introduced a method for extracting vortices from the discretized complex order parameter field generated by a large-scale simulation of vortex matter. With this method, at a fixed time step, each vortex [simplistically, a one-dimensional (1D) curve in 3D space] can be represented as a connected graph extracted from the discretized field. Here we extend this method as a function of time as well. A vortex now corresponds to a 2D space-time sheet embedded in 4D space time that can be represented as a connected graph extracted from the discretized field over both space and time. Vortices that interact by merging or splitting correspond to disappearance and appearance of holes in the connected graph in the time direction. This method of tracking vortices, which makes no assumptions about the scale or behavior of the vortices, can track the vortices with a resolution as good as the discretization of the temporally evolving complex scalar field. Additionally, even details of the trajectory between time steps can be reconstructed from the connected graph. With this form of vortex tracking, the details of vortex dynamics in a model of a superconducting materials can be understood in greater detail than previously possible.

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Anisotropic superconductors in tilted magnetic fields

Cited by 13 publications

References 46 publications

Crossing fields in thin films of isotropic superconductors

Crossing fields in thin films of isotropic superconductors

Tilted vortex cores and superconducting gap anisotropy in 2H-NbSe2

Tracking vortices in superconductors: Extracting singularities from a discretized complex scalar field evolving in time

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