Quantitative analysis of the critical current due to vortex pinning by surface corrugation

Pautrat, Alain; Scola, J.; Goupil, Christophe; Simon, Ch.; Villard, Catherine; Domengès, B.; Simon, Y.; Guilpin, Ch.; Méchin, Laurence

doi:10.1103/physrevb.69.224504

Cited by 31 publications

(33 citation statements)

References 20 publications

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“…The dominant pinning mechanism in pure Nb is generally surface pinning [26,27] which has no direct relation with a bulk disordering of the lattice [40]. As a consequence, significant critical current can be present without direct relation with vortex disorder due to bulk pinning.…”

Section: Pioneering Magnetic Decoration Experiments Havementioning

confidence: 99%

Temperature dependence of clusters with attracting vortices in superconducting niobium studied by neutron scattering

Pautrat¹,

Brûlet²

2014

J. Phys.: Condens. Matter

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We have investigated the intermediate mixed state of a superconducting niobium sample by Very Small Angle Neutron Scattering. We show that this state is stabilized through a sequence where a regular vortex lattice appears, which then coexists with vortex clusters before vanishing at low temperature. Vortices in clusters have a constant periodicity regardless of the applied field, exhibit a temperature dependence close to the one of the penetration depth. The clusters disappear in the high temperature limit. All the results agree with an explanation in terms of vortex attraction due non local effects, and indicate a negligible role of pinning. Phase coexistence between Abrikosov vortex lattice and vortex clusters is reported showing the first order nature of the boundary line.

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Section: Pioneering Magnetic Decoration Experiments Havementioning

confidence: 99%

Temperature dependence of clusters with attracting vortices in superconducting niobium studied by neutron scattering

Pautrat¹,

Brûlet²

2014

J. Phys.: Condens. Matter

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“…[50][51][52][53] If we assume that the current flows at least over the magnetic penetration depth λ close to the surface, we obtain a maximal value for the 064518-2 The superconducting density of states of vortex-free areas at zero current is significantly different than the one found at zero field. Close to zero bias, the tunneling conductance is smeared (Fig.…”

mentioning

confidence: 99%

Supercurrent on a vortex core in 2H-NbSe2: Current-driven scanning tunneling spectroscopy measurements

Vieira

Suderow

2013

Phys. Rev. B

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We report current-driven scanning tunneling spectroscopy (CDSTS) measurements at very low temperatures on vortices in 2H-NbSe 2 . We find that a current produces an increase of the density of states at the Fermi level in between vortices and a reduction of the zero-bias peak at the vortex center. This occurs well below the depairing current. We conclude that a supercurrent affects the low-energy part of the superconducting gap structure of 2H-NbSe 2 .

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“…The ion penetration depth is determined by the ion energy (1 ÷ 30 keV typically) and the atomic number of the constituent atoms. An early report on the use of FIB-milled trenches to increase the critical current in Nb films can be found in [71]. Precursor molecules (here: organometallic complex; blue: metal, green: organic ligands) are supplied by a gas-injection system and physisorb (1) on the surface.…”

Section: Processing Of Surfaces By Focused Particle Beamsmentioning

confidence: 99%

Abrikosov fluxonics in washboard nanolandscapes

Dobrovolskiy

2017

Physica C: Superconductivity and its Applications

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Abrikosov fluxonics, a domain of science and engineering at the interface of superconductivity research and nanotechnology, is concerned with the study of properties and dynamics of Abrikosov vortices in nanopatterned superconductors, with particular focus on their confinement, manipulation, and exploitation for emerging functionalities. Vortex pinning, guided vortex motion, and the ratchet effect are three main fluxonic "tools" which allow for the dynamical (pinned or moving), the directional (angle-dependent), and the orientational (current polaritysensitive) control over the fluxons, respectively. Thanks to the periodicity of the vortex lattice, several groups of effects emerge when the vortices move in a periodic pinning landscape: Spatial commensurability of the location of vortices with the underlying pinning nanolandscape leads to a reduction of the dc resistance and the microwave loss at the so-called matching fields. Temporal synchronization of the displacement of vortices with the number of pinning sites visited during one half ac cycle manifests itself as Shapiro steps in the current-voltage curves. Delocalization of vortices oscillating under the action of a high-frequency ac drive can be tuned by a superimposed dc bias. In this short review a choice of experimental results on the vortex dynamics in the presence of periodic pinning in Nb thin films is presented. The consideration is limited to one particular type of artificial pinning structures -directly written nanolandscapes of the washboard type, which are fabricated by focused ion beam milling and focused electron beam induced deposition. The reported results are relevant for the development of fluxonic devices and the reduction of microwave losses in superconducting planar transmission lines.

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Quantitative analysis of the critical current due to vortex pinning by surface corrugation

Cited by 31 publications

References 20 publications

Temperature dependence of clusters with attracting vortices in superconducting niobium studied by neutron scattering

Temperature dependence of clusters with attracting vortices in superconducting niobium studied by neutron scattering

Supercurrent on a vortex core in 2H-NbSe2: Current-driven scanning tunneling spectroscopy measurements

Abrikosov fluxonics in washboard nanolandscapes

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