Hysteresis in Superconductors. I. Flux Trapping in Low- and High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>κ</mml:mi></mml:math>Materials

Schweitzer, D.G.; Garber, M.; Bertman, B.

doi:10.1103/physrev.159.296

Cited by 18 publications

(5 citation statements)

References 10 publications

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“…Torr the same field the major hysteresis loop is always observed to join the initial magnetization curve in good agreement with similar measurements by Schweitzer et al15.…”

supporting

confidence: 92%

Direct observation of the critical state in low-κ type-II superconductors

Weber¹,

Pfeiffer²,

Rauch³

1971

Z. Physik

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New results on the properties of niobium and vanadium in the mixed state obtained by the neutron depolarization method are presented. Magnetization measurements were taken on several samples differing in their degree of hysteresis to obtain the characteristic fields Hd, H + and Hc2 (H + denotes the field where the major hysteresis loop for one sense joins the initial magnetization curve). The depolarization is always observed to begin at Hcl and to disappear at H +. A theoretical reexamination of the critical state concept for low-x type-II superconductors leads to the conclusion that the maximum depolarization indicates the entrance of the entire sample into the critical state. The actual value of the depolarization is shown to be a measure of the flux line lattice distortions. Furthermore, evidence for an anisotropic flux density distribution in the mixed state is presented.

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“…Torr the same field the major hysteresis loop is always observed to join the initial magnetization curve in good agreement with similar measurements by Schweitzer et al15.…”

supporting

confidence: 92%

Direct observation of the critical state in low-κ type-II superconductors

Weber¹,

Pfeiffer²,

Rauch³

1971

Z. Physik

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“…The magnetization hysteresis occurs due to surface currents, flux pinning, and the existence of different phases. [ 19–21 ] The hysteresis effects in current–voltage characteristics (CVC) are found in superconductor nanowires and microbridges [ 2,22,23 ] both theoretically and experimentally. As a rule, the hysteresis effect is explained by the change of the effective temperature of quasiparticles due to the Joule heating [ 24,25 ] or the finite relaxation time of the order parameter magnitude.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Hysteresis Effect in Superconductor Nb Open Nanotubes

Bogush

Fomin

2023

Physica Rapid Research Ltrs

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Superconductor Nb open nanotubes are analyzed under a strong transport current in an external magnetic field using the time‐dependent Ginzburg–Landau equations. The geometric properties of the hysteresis loop in current–voltage characteristics are described for nanotubes of different radii from 190 to 440 nm as a function of the magnetic field. The hysteresis effect appears at a constant temperature as a result of the order parameter dynamics. In nanotubes of radii equal to 240 nm and larger, the area of the hysteresis loop manifests a non‐monotonic behavior as a function of the external magnetic field with a maximum ranging from 15 to 20 mT. Normal conductivity is shown to have a crucial impact on the hysteresis effect in superconductor open nanotubes. Namely, a higher normal conductivity leads to the disappearance of the hysteresis effect. As a rule, the upper and lower branches of the hysteresis loop are provided by the phase‐slip and vortex regimes, correspondingly. Just before the transition of the system from the upper branch to the lower one, the way of nucleation and annihilation of vortices in the region with suppressed superconductivity experiences readjustment.

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“…The hysteresis effects in superconductor magnetization resulting from the surface currents, flux pinning and the existence of different phases are well known for a long time [28][29][30]. The hysteresis effects in current-voltage characteristics are found theoretically and experimentally in superconducting nanowires and microbridges [3,[31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Topological defects in superconducting open nanotubes under gradual and abrupt switch-on of the transport current and magnetic field

Bogush¹,

Fomin²

2021

Preprint

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We analyze the dynamics of the order parameter in superconducting open nanotubes under a strong transport current in an external homogeneous magnetic field using the time-dependent Ginzburg-Landau equation. Near the critical transport current, the dissipation processes are driven by vortex and phase slip dynamics. The transition between the vortex and phase-slip regimes is found to depend on the external magnetic field only weakly if the magnetic field and/or the transport current are switched on gradually. In the case of an abrupt switch-on of the magnetic field or transport current, the system can be triggered to the stable phase-slip regime, within a certain window of parameters.Finally, a hysteresis effect in the current-voltage characteristics is predicted in superconducting open nanotubes.

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Hysteresis in Superconductors. I. Flux Trapping in Low- and High-κMaterials

Cited by 18 publications

References 10 publications

Direct observation of the critical state in low-κ type-II superconductors

Direct observation of the critical state in low-κ type-II superconductors

Optimization of the Hysteresis Effect in Superconductor Nb Open Nanotubes

Topological defects in superconducting open nanotubes under gradual and abrupt switch-on of the transport current and magnetic field

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