Temperature dependence of the vortex nucleation field of thin-film, type II superconductors

Yamashita, T.; Rinderer, L.

doi:10.1007/bf00657174

Cited by 18 publications

(13 citation statements)

References 2 publications

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“…The meander with a 104-nm strip width exhibits similar pronounced steps at fields of ß265, 577, and 883 mT. These steps have been observed before in superconducting thin films [26][27][28][29]. Karapetrov et al [27] ascribe the appearing kinks to structural reordering of the vortices due to the magnetic field within the film.…”

Section: A Critical Currentsupporting

confidence: 57%

Effect of magnetic field on the photon detection in thin superconducting meander structures

et al. 2014

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We have studied the influence of an externally applied magnetic field on the photon and dark count rates of meander-type niobium nitride superconducting nanowire single-photon detectors. Measurements have been performed at a temperature of 4.2 K, and magnetic fields up to 250 mT have been applied perpendicularly to the meander plane. While photon count rates are field independent at weak applied fields, they show a strong dependence at fields starting from approximately ±25 mT. This behavior, as well as the magnetic field dependence of the dark count rates, is in good agreement with the recent theoretical model of vortex-assisted photon detection and spontaneous vortex crossing in narrow superconducting lines. However, the local reduction of the superconducting free energy due to photon absorption, which is the fitting parameter in the model, increases much slower with the photon energy than the model predicts. Furthermore, changes in the free-energy during photon counts and dark counts depend differently on the current that flows through the meander. This indicates that photon counts and dark counts occur in different parts of the meander.

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Section: A Critical Currentsupporting

confidence: 57%

Effect of magnetic field on the photon detection in thin superconducting meander structures

et al. 2014

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“…The measurements of the critical current in films under a parallel field reported in Refs. [9][10][11][12] can also be compared to the ideal model predictions. The main characteristics of these predictions are a non-monotonic J c × H dependence and values of J c ∼ 1 − 9 × 10 −2 J d .…”

Section: Discussionmentioning

confidence: 99%

“…Measurements on films in this geometry of the magnetization and of the critical current have been reported by several authors [6][7][8][9][10][11][12]. It is found that the magnetization has peaks as a function of the field, not present in the bulk material, which are interpreted as resulting from the transitions involving the change in the number of chains [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…It is found that the magnetization has peaks as a function of the field, not present in the bulk material, which are interpreted as resulting from the transitions involving the change in the number of chains [6][7][8]. Some of the critical current measurements find non-monotonic dependence on the field that is also attributed to these transitions [9][10][11]. Other measurements find no such dependence, but the large critical currents observed are interpreted as due to pinning of the vortex-lines by the shielding current [12].…”

Section: Introductionmentioning

confidence: 99%

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Equilibrium vortex-line configurations and critical currents in thin films under a parallel field

Carneiro

1998

Phys. Rev. B

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“…[1][2][3][4][5][6] Here we consider an unusual setup: that of the Little-Parks experiment, [7][8][9] i.e., a superconducting loop which encloses a magnetic flux.…”

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confidence: 99%

Flux-induced vortex in mesoscopic superconducting loops

Berger

Rubinstein

1999

Phys. Rev. B

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We predict the existence of a quantum vortex for an unusual situation. We study the order parameter in doubly connected superconducting samples embedded in a uniform magnetic field. For samples with perfect cylindrical symmetry, the order parameter has been known for a long time and no vortices are present in the linear regime. However, if the sample is not symmetric, there exist ranges of the field for which the order parameter vanishes along a line, parallel to the field. In many respects, the behavior of this line is qualitatively different from that of the vortices encountered in type-II superconductivity. For samples with mirror symmetry, this flux-induced vortex appears at the thin side for small fluxes and at the opposite side for large fluxes. We propose direct and indirect experimental methods which could test our predictions.

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Temperature dependence of the vortex nucleation field of thin-film, type II superconductors

Cited by 18 publications

References 2 publications

Effect of magnetic field on the photon detection in thin superconducting meander structures

Effect of magnetic field on the photon detection in thin superconducting meander structures

Equilibrium vortex-line configurations and critical currents in thin films under a parallel field

Flux-induced vortex in mesoscopic superconducting loops

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