Vortex dynamics in 2H-NbSe2 containing striped regions of columnar defects

André, M.-O.; Polichetti, Massimiliano; Pastoriza, H.; Kes, P.H.

doi:10.1016/s0921-4534(00)00302-6

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…In presence of strong spatial pinning inhomogeneity, the disordered phase can give rise to a distribution of pinning forces leading in some cases to easy flux-flow channels or to vortex shearing. 11 The change in the vortex motion from a plastically disordered flow to a more ordered elastic motion, i.e., dynamic ordering, 12 related to the reduction of the mean pinning force, corresponds to the presence of a peak in the differential resistance R d = dV / dI. Such a peak occurs at a definite value of the bias current, which strongly depends on the magnetic field and temperature for a certain degree of disorder in the sample.…”

Section: Introductionmentioning

confidence: 99%

Dynamic ordering and instability of the vortex lattice in Nb films exhibiting moderately strong pinning

et al. 2009

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We study the nonlinear effects in the current-voltage characteristics of Nb superconducting thin films, induced both by the current dependence of the pinning force and by the electric-field dependence of the flux-flow resistance of Abrikosov vortices driven by high electric currents. Despite of the quite strong pinning in our samples, by increasing the bias current, in a temperature dependent magnetic-field range, the moving vortex system undergoes a dynamical transition from a disordered to an ordered vortex lattice. Such transition leads to a quite sharp reduction of the dynamic pinning force corresponding to a peak in the current dependence of the differential flux-flow resistance. On the same samples, in a higher voltage-velocity regime, for a different temperature dependent magnetic-field range, an instability of the moving vortex lattice also occurs, with a sudden jump in the I-V curve from the non linear flux-flow branch to the linear normal resistive state. Within the Larkin-Ovchinnikov velocity dependence of the flux-flow resistance, this flux-flow instability has been studied as function of the magnetic field and temperature in order to get out its nonequilibrium electronic nature. Finally, we propose a dynamic phase diagram to describe the vortex lattice motion driven by high electric currents in the presence of such a disordered pinning landscape.

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Section: Introductionmentioning

confidence: 99%

Dynamic ordering and instability of the vortex lattice in Nb films exhibiting moderately strong pinning

et al. 2009

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“…Confinement of superconductivity to quasi-1D translates into confinement of the superconducting vortices. Abrikosov vortex structures constrained to onedimensional superconducting condensate has been actively studied [9,10,11,12,13,14,15] in order to examine novel static and dynamic vortex phases. Magnetic imaging of the vortex structures in these systems have been challenging, in particular in the cases where effective penetration depth of the superconductor (i.e.…”

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confidence: 99%

Transverse instabilities of multiple vortex chains in magnetically coupledNbSe2/permalloysuperconductor/ferromagnet bilayers

et al. 2009

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Using scanning tunneling microscopy and Ginzburg-Landau simulations, we explore vortex configurations in magnetically coupled NbSe2-Permalloy superconductor-ferromagnet bilayer. The Permalloy film with stripe domain structure induces periodic local magnetic induction in the superconductor, creating a series of pinning-antipinning channels for externally added magnetic flux quanta. Such laterally confined Abrikosov vortices form quasi-1D arrays (chains). The transitions between multichain states occur through propagation of kinks at the intermediate fields. At high fields we show that the system becomes non-linear due to a change in both the number of vortices and the confining potential. The longitudinal instabilities of the resulting vortex structures lead to vortices 'levitating' in the anti-pinning channels.

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“…Defect topology can drastically affect the dynamic behavior of NbSe 2 . For instance, the effect of columnar defects parallel to the c axis produced by ion irradiation [13] on the vortex pinning properties in NbSe 2 has been widely investigated [14][15][16]5].…”

Section: Introductionmentioning

confidence: 99%

AC response of 2H–NbSe₂single crystals with electron-irradiation-induced defects

Bartolomé¹,

Bartolomé²,

Arauzo³

et al. 2010

J. Phys.: Condens. Matter

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The generation of defects in NbSe(2) single crystals by electron irradiation has been investigated by a combination of ac susceptibility and structural measurements. Remarkably, thanks to the layered structure of NbSe(2), we show that electronic irradiation cannot only create point defects but also in-plane extended defects, which modify anisotropically the ac response. Indeed, the analysis of the onset of the nonlinear susceptibility response, H(ac)(l)(T), as a function of irradiation dose and field orientation shows a correlated increase in the density of anisotropic defects induced by electron irradiation. Also, we measured a decrease in the strength of the pinning (Labusch) constant α(L) accounting for elastic vortex oscillations within the linear Campbell regime for high-dose-irradiated samples in a transverse field, again compatible with the presence of planar defects hindering vortex pinning. X-ray powder diffraction and TEM electron diffraction measurements suggest these in-plane defects may result from the rupture of Se-Se bonds and the formation of nanorods and nanowires by NbSe(2) sheet rolling.

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Vortex dynamics in 2H-NbSe2 containing striped regions of columnar defects

Cited by 6 publications

References 29 publications

Dynamic ordering and instability of the vortex lattice in Nb films exhibiting moderately strong pinning

Dynamic ordering and instability of the vortex lattice in Nb films exhibiting moderately strong pinning

Transverse instabilities of multiple vortex chains in magnetically coupledNbSe2/permalloysuperconductor/ferromagnet bilayers

AC response of 2H–NbSe₂single crystals with electron-irradiation-induced defects

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Vortex dynamics in 2H-NbSe2 containing striped regions of columnar defects

Cited by 6 publications

References 29 publications

Dynamic ordering and instability of the vortex lattice in Nb films exhibiting moderately strong pinning

Dynamic ordering and instability of the vortex lattice in Nb films exhibiting moderately strong pinning

Transverse instabilities of multiple vortex chains in magnetically coupledNbSe2/permalloysuperconductor/ferromagnet bilayers

AC response of 2H–NbSe2single crystals with electron-irradiation-induced defects

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AC response of 2H–NbSe₂single crystals with electron-irradiation-induced defects