Spontaneous pattern formation in superconducting films

Córdoba-Camacho, W. Y.; Silva, R. M. da; Shanenko, A. A.; Vagov, Alexei; Vasenko, A. S.; Lvov, Boris G.; Aguiar, J. Albino

doi:10.1088/1361-648x/ab5379

Cited by 10 publications

(7 citation statements)

References 61 publications

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“…The choice of an infinitely long system, instead of being a limiting factor, really expands the importance of the present results once it allows us to see intrinsic effects. Geometrical factors [39][40][41][42] hinder the observation of the intrinsic transitions observed here. It is well known that a sufficiently thin type-I superconductor turns into a type-II one by a change of its thickness.…”

Section: Introductionmentioning

confidence: 64%

Intermediate type-I superconductors in the mesoscopic scale

et al. 2021

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described the existence of an intermediate type-I superconductor as a consequence of an external surface that affects the well-known classification of superconductors into type I and II. Here we consider the mesoscopic superconductor where the volume-to-area ratio is small and the effects of the external surface are enhanced. By means of the standard Ginzburg-Landau theory, the Tinkham-de Gennes scenario is extended to the mesoscopic type-I superconductor. We find additional features of the transition at the passage from the genuine to the intermediate type I. The latter has two distinct transitions, namely from a paramagnetic to diamagnetic response in descending field, and a quasi-type-II behavior as the critical coupling 1/ √ 2 is approached in ascending field. The intermediate type-I phase proposed here, and its corresponding transitions, reflect intrinsic features of the superconductor and not its geometrical properties.

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Section: Introductionmentioning

confidence: 64%

Intermediate type-I superconductors in the mesoscopic scale

et al. 2021

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“…The choice of an infinitely long system, instead of being a limiting factor, really expands the importance of the present results, once it allows to see intrinsic effects. Geometrical factors [39][40][41][42] hinder the observation of the intrinsic transitions observed here. It is well known that a sufficiently thin type I superconductor turns into a type II one by a change of its thickness.…”

Section: Introductionmentioning

confidence: 64%

The intermediate type-I superconductors in the mesoscopic scale

Cadorim,

Sardella,

Romaguera

et al. 2020

Preprint

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M. Tinkham and P. G. de Gennes, described in their books [1,2] the existence of an intermediate type-I superconductor as a consequence of an external surface that affects the well known classification of superconductors into type-I and II. Here we consider the mesoscopic superconductor where the ratio volume to area is small and the effects of the external surface are enhanced. By means of the standard Ginzburg-Landau theory the Tinkham-de Gennes scenario is extended to the mesoscopic type-I superconductor. We find new features of the transition at the passage from the genuine to the intermediate type-I. The latter has two distinct transitions, namely, from a paramagnetic to diamagnetic response in descending field and a quasi type-II behavior as the critical coupling 1/ √ 2 is approached in ascending field. The intermediate type-I phase proposed here, and its corresponding transitions, reflect intrinsic features of the superconductor and not its geometrical properties.

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“…These exotic flux patterns cannot be classified in any of these primary classes then they are classified as inter-type patterns according to that formalism. They can be risen by a variety of factors like temperature, disorder, and geometric effects [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Controlling soft vortex matter: edge effects on vortex configurations and partial vortices in a superconducting type-II/type-I bilayer

Córdoba-Camacho¹,

Silva²,

Barba-Ortega³

et al. 2020

J. Phys.: Condens. Matter

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We demonstrate that the presence of edges in a superconducting film made of a type-I/type-II bilayer stabilizes type-II/type-I hybrid (inter-type) flux patterns, as vortex clusters, chains, and gel phase. These patterns are very sensitive to primary parameters such as applied magnetic field, layer coupling, and temperature. Thus, the magnetization versus temperature curves, M(T), for many values of coupling were used to estimate the strength of the layer couplings, and also as a guide for obtaining sequentially the flux patterns. We also show that the effect of the borders on the unrestricted states is to shift them to states of higher density, since they introduce extra compression on the vortex matter. For a low layer coupling regime, we observe an unusual magnetic response where few partial vortices (partial in a sense they miss the contribution of the type I part), repelling each other and bounded to the surfaces, populate one layer leaving the other empty. We expect that the predicted flux configurations can stimulate experimentalists in trying to observe them by direct imaging techniques.

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Spontaneous pattern formation in superconducting films

Cited by 10 publications

References 61 publications

Intermediate type-I superconductors in the mesoscopic scale

Intermediate type-I superconductors in the mesoscopic scale

The intermediate type-I superconductors in the mesoscopic scale

Controlling soft vortex matter: edge effects on vortex configurations and partial vortices in a superconducting type-II/type-I bilayer

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