Flux-Flow Resistance in Type-II Superconductors

Kim, Y. B.; Hempstead, C. F.; Strnad, A. R.

doi:10.1103/physrev.139.a1163

Cited by 581 publications

(182 citation statements)

References 37 publications

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“…The magnetic field dependencies of flux-flow resistivity ρ f (B) were found to be qualitatively different from that observed in single-band superconductors 7 . This behaviour is not explained by the theories developed in previous works.…”

Section: Introductioncontrasting

confidence: 62%

“…Fluxflow experiments in single-band superconductors at low temperatures and magnetic fields 7 are well described by the Bardeen-Stephen (BS) theory 8 . In this regime the flux-flow resistivity is given by the linear magnetic field dependence…”

Section: -14mentioning

confidence: 99%

“…The BS law is in the qualitative agreement with the results obtained based on the microscopic theory for dirty superconductors 9 . At larger magnetic fields the dependence ρ f (B) becomes essentially non-linear 7,15 . At elevated temperatures the significant growth of β results in the suppressed magneto-resistivity as compared to the BS value 10,16 .…”

Section: -14mentioning

confidence: 99%

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Vortex motion and flux-flow resistivity in dirty multiband superconductors

Силаев

Vargunin

2016

Phys. Rev. B

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The conductivity of vortex lattices in multiband superconductors with high concentration of impurities is calculated based on microscopic kinetic theory. Both the limits of high and low fields are considered, when the magnetic induction is close to or much smaller than the critical field strength Hc2, respectively. It is shown that in contrast to single-band superconductors the resistive properties are not universal but depend on the pairing constants and ratios of diffusivities in different bands. The low-field magneto-resistance can strongly exceed Bardeen-Stephen estimation in a quantitative agreement with experimental data for two-band superconductor MgB2.

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Section: Introductioncontrasting

confidence: 62%

Section: -14mentioning

confidence: 99%

Section: -14mentioning

confidence: 99%

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Vortex motion and flux-flow resistivity in dirty multiband superconductors

Силаев

Vargunin

2016

Phys. Rev. B

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“…The first description was based on the motion of Abrikosov vortices. [1][2][3][4][5][6] Nowadays flux-creep and flux-flow mechanisms are well accepted to describe, respectively, non-linear and linear parts of current-voltage ( V I − ) characteristic curves of homogeneous superconductors. [5][6][7] In the flux-flow regime, the Lorentz force on an Abrikosov vortex is much higher than the pinning force resulting in vortex motion on a viscous medium under the influence of Magnus force due to supercurrents circulating around the vortex core.…”

Section: Introductionmentioning

confidence: 99%

Two-fluid model for transport properties of granular superconductors

Santos¹,

Oliveira²,

Luz³

et al. 2006

Phys. Rev. B

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A two-fluid model is proposed to describe the transport properties of granular superconductors. Using the resistively shunted junction model and some aspects of the two-level system theory, a statistical model is developed which takes into account the ratio between the number of normal and superconducting electrons carrying the applied current. The theoretical model reveals excellent agreement when compared to transport properties of four high-C T superconductors. The results suggest that the two-fluid model is independent of the sample composition, critical temperature and whether the superconducting compound is electron or hole-doped.

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“…The Lorentz force tends to move the vortices perpendicular to the current, giving rise to a dissipation. 13 Thus, the application of increasingly high magnetic field results in a monotonous enhancement of the resistance before reaching the normal state.…”

mentioning

confidence: 99%

Andreev reflection under high magnetic fields in ferromagnet-superconductor nanocontacts

et al. 2011

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We study the magnetic-field dependence of the conductance in planar ferromagnet-superconductor nanocontacts created with focused-electron/ion-beam techniques. From the fits of the differential conductance curves in high magnetic fields, we obtain the magnetic field dependences of the superconducting gap and the broadening parameter. Orbital depairing is found to be linear with magnetic field. We evaluate the magnetic field dependence of the quasiparticle density of states, and we compare it with the value obtained by scanning tunneling spectroscopy experiments. The study of the differential conductance (that is the first derivative of the I-V characteristic, dI/dV) of point contacts has been demonstrated to be an effective tool to probe the interaction mechanisms in conductive materials: inelastic scattering of electrons by phonons, 1 scattering of electrons by magnons, 2 etc. If one of the electrodes forming the point contact is superconductor, through the study of the Andreev reflection 3 (AR) occurring at the interface it is possible to obtain information on the superconducting gap. In ferromagnet-superconductor point contacts, along with the information on the superconductor gap, the ferromagnet spin polarization can be extracted, 4,5 making this type of study very appealing.The superconductor density of states under magnetic field is a relevant parameter in basic studies of superconductivity as well as in applications where the superconductor is under the influence of high magnetic fields. AR measurements in a magnetic field provide further information on the properties of the superconducting 6 and ferromagnetic electrodes of the contact. So far no systematic investigations of ferromagnetsuperconductor nanocontacts under high magnetic fields have been carried out. A comprehensive study of the effect of a magnetic field on the transport properties of ferromagnetsuperconductor nanocontacts is due to 7 and the maximum magnetic field applied in this study is 16.5 mT, since the critical field of the Al electrode used as the superconducting electrode is 15 mT. In this Brief Report, we propose a different approach to evaluate the magneticfield dependence of the quasiparticle density of states of superconductors from the measurement of the conductance in high magnetic fields.The nanocontacts are created between a superconducting W nanodeposit and a magnetic Co nanodeposit under high vacuum conditions using commercial dual beam equipment that integrates a focused electron column and a focused Ga ion column forming 52 degrees. Focused-electron-beam-induced deposition of magnetic Co (FEBID-Co) and focused-ionbeam-induced deposition of superconducting W (FIBID-W) are made following previous work. [8][9][10] Nanocontacts are obtained by suitably nanoshaping the Co-based magnetic deposit into a sharp tip-like structure, contacting the W-based superconductor. Importantly, the two electrodes forming the contact are grown under high vacuum, minimizing oxidation during contact formation. The in situ monitoring of the resista...

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Flux-Flow Resistance in Type-II Superconductors

Cited by 581 publications

References 37 publications

Vortex motion and flux-flow resistivity in dirty multiband superconductors

Vortex motion and flux-flow resistivity in dirty multiband superconductors

Two-fluid model for transport properties of granular superconductors

Andreev reflection under high magnetic fields in ferromagnet-superconductor nanocontacts

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