Direct evidence for quantized flux threads in type - II superconductors

Boato, G.; Gallinaro, G.; Rizzuto, C.

doi:10.1016/0038-1098(65)90285-1

Cited by 35 publications

(13 citation statements)

References 7 publications

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“…[1][2][3] Tuning the external applied magnetic field one can switch between rich varieties of energetically favorable or metastable vortex configurations, which cannot be realized in bulk systems. Of particular interest is a possibility to obtain multiquanta ͑giant͒ vortex states with winding numbers larger than unity for certain intervals of external magnetic field ͑see, e.g., Ref.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and heat transport of multivortex configurations in mesoscopic superconductors

2008

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On the basis of the Bogoliubov-de Gennes theory we study the transformation of the quasiparticle spectrum in the mixed state of a mesoscopic superconductor, governed by an external magnetic field. We analyze the low-energy part of the excitation spectrum and investigate the field dependent behavior of anomalous spectral branches crossing the Fermi level. Generalizing the Caroli-de Gennes-Matricon approach, we present an analytical solution describing the anomalous branches in a vortex with an arbitrary winding number. We also study the spectrum transformation caused by the splitting of a multiquantum vortex into a set of well separated vortices focusing mainly on a generic example of a two-vortex system. For vortices positioned rather close to the sample surface we investigate the effect of the quasiparticle reflection at the boundary on the spectrum and the density of states at the Fermi level. Considering an arbitrary surface curvature, we study the disappearance of an anomalous spectral branch for a vortex leaving the sample. The changes in the vortex configuration and resulting transformation of the anomalous branches are shown to affect strongly the density of states and the heat conductance along the magnetic-field direction.

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Section: Introductionmentioning

confidence: 99%

Electronic structure and heat transport of multivortex configurations in mesoscopic superconductors

2008

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“…This value is approximately one order of magnitude higher than the time for the single-vortex creation. This was measured for the first time by G. Boato, G.Gallinaro and C. Rizzuto [28], who showed that this time is less than 10 −5 s.…”

Section: Resultsmentioning

confidence: 99%

Investigation of relaxation phenomena in high-temperature superconductors HoBa2Cu3O7−δ at the action of pulsed magnetic fields

Chigvinadze¹,

Acrivos

Ashimov³

et al. 2007

Physics Letters A

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A mechanical method to investigate the stimulated Abrikosov vortex dynamics in superconductors has been used. We found out that pulsed magnetic fields change the path of relaxation processes taking place in vortex matter. The study of the influence of magnetic pulses differing in their durations and amplitudes on the vortex system of the isotropic high-temperature superconductor system HoBa 2 Cu 3 O 7−δ showed the presence of a threshold phenomena. Short duration pulses do not change the path of relaxation processes taking place in vortex matter. When the duration of pulses exceeds some critical value (threshold), then their influence changes the path of relaxation process which is revealed by a stepwise change of the relaxing mechanical moment τ rel . These investigations showed that the time for formatting of the Abrikosov vortex lattice in HoBa 2 Cu 3 O 7−δ is of the order of 20 µs which exceeds by one order of magnitude the time necessary for formation of a single vortex observed in type II superconductors.

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“…͑21͒ in more detail. Within the standard quasiclassical approximation ͑assuming k r ӷ1) this solution can be written in the form ͑we take the equation for ⌿ ϩ for definiteness͒ ⌿ ϩ ϭg 1 (r)H (1) (k r r) ϩg 2 (r)H (2) (k r r), where H (1,2) (k r r) are Hankel functions and g 1,2 are slowly varing envelopes. Far from the normal metal cylinder (rӷa,⌬ϭconst) we have the two exact solutions H (1,2)…”

Section: ͑20͒mentioning

confidence: 99%

“…Ϫ2ik F /). Inside the normal metal cylinder (⌬ϭ0) there are also two exact solutions H (1,2) (k r r). To avoid a divergence of the wave function for r→0 we must match the two independent solutions at the origin and obtain Bessel function for small r. One can see that for nonzero imaginary part of the wave vector ͱk r 2…”

Section: ͑20͒mentioning

confidence: 99%

Quasiparticle excitations and ballistic transport in the mixed state of mesoscopic superconductors

Mel’nikov

Винокур

2002

Phys. Rev. B

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Direct evidence for quantized flux threads in type - II superconductors

Cited by 35 publications

References 7 publications

Electronic structure and heat transport of multivortex configurations in mesoscopic superconductors

Electronic structure and heat transport of multivortex configurations in mesoscopic superconductors

Investigation of relaxation phenomena in high-temperature superconductors HoBa2Cu3O7−δ at the action of pulsed magnetic fields

Quasiparticle excitations and ballistic transport in the mixed state of mesoscopic superconductors

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