Vortex dynamics at the transition to the normal state in YBa2Cu3O7−δ films

Bernstein, P.; Hamet, J. F.; González, M. Teresa; Acuña, M. Ruibal

doi:10.1016/j.physc.2007.01.012

Cited by 10 publications

(22 citation statements)

References 52 publications

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“…For all the films is zero at and increases as the temperature decreases down to temperature . At lower temperatures, the values cluster around those computed with the equation (6) Equation (6) is derived taking into account the small size defects that exist in the boundary planes, but that are not large enough to cause a disruption of the tunneling current. They are included in the weak links and, in the critical state, they limit the pair coupling current to the lowest value maintaining the phase coherence across the boundary planes against thermal fluctuations.…”

Section: Weak Link Current In the Critical Statementioning

confidence: 65%

“…This results in the modulation of their width. In previous works [5], [6], we have suggested that although a tunneling pair current goes across most of the length of the boundary planes, the separation between the superconducting sides of the boundary plane can be large enough at some places to cause a local disruption of this current. This is expected to result in the splitting of the boundary planes into rows of Josephson weak links.…”

Section: Introductionmentioning

confidence: 85%

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Transport Properties of ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Thin Films Near the Critical State

Bernstein

Hamet

Thimont

2009

IEEE Trans. Appl. Supercond.

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Transport measurements carried out on YBa 2 Cu 3 O 7 films are compared to a model suggesting that the films boundary planes behave as rows of Josephson weak links. The obtained results suggest that, except if the films are very thin, the boundary planes do not consist of a single row but of superimposed rows across the film thickness, whose existence is attributed to extended defects generated by Y 2 O 3 inclusions.An expression for the critical surface current density valid in a large temperature range above a threshold value and depending on T, T c and the number of superimposed weak links rows is derived from this conclusion and found in good agreement with the measurements. The critical current densities measured below the threshold are accounted for supposing that the oxygen content is not uniform in the samples.

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Section: Weak Link Current In the Critical Statementioning

confidence: 65%

Section: Introductionmentioning

confidence: 85%

Transport Properties of ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Thin Films Near the Critical State

Bernstein

Hamet

Thimont

2009

IEEE Trans. Appl. Supercond.

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“…According to the critical state model [6,37] (6) and (7), which take into account both the RSJ model and vortex dynamics (blue and red line at 340 mK and 3 K, respectively). The inset shows the same I-V curves in a wider range of current and voltage.…”

Section: What Might Happen In the I-v Curvesmentioning

confidence: 99%

What happens in Josephson junctions at high critical current densities

Massarotti¹,

Stornaiuolo²,

Lucignano³

et al. 2017

Low Temperature Physics

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The impressive advances in material science and nanotechnology are more and more promoting the use of exotic barriers and/or superconductors, thus paving the way to new families of Josephson junctions. Semiconducting, ferromagnetic, topological insulator and graphene barriers are leading to unconventional and anomalous aspects of the Josephson coupling, which might be useful to respond to some issues on key problems of solid state physics. However, the complexity of the layout and of the competing physical processes occurring in the junctions is posing novel questions on the interpretation of their phenomenology. We classify some significant behaviors of hybrid and unconventional junctions in terms of their first imprinting, i.e. current-voltage curves, and propose a phenomenological approach to describe some features of junctions characterized by relatively high critical current densities J c . Accurate arguments on the distribution of switching currents will provide quantitative criteria to understand physical processes occurring in high-J c junctions. These notions are universal and apply to all kinds of junctions.

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“…[17][18][19] The model is valid for films whose thickness is in the range of or smaller than 2 ab ͑ ab is the superconducting penetration depth in the a-b planes of YBCO͒. In the second part of this section, we examine the conditions in which some of the Josephson weak links included in the films boundary planes can cause the modulation of the sample critical current when a low magnetic field is applied and we discuss the possible expressions of the modulated current.…”

Section: Properties Of Ybco Films In the Critical State With No Amentioning

confidence: 99%

“…[17][18][19] A consequence of this model is that the modulation of the critical current of the films should be observed in the vicinity of the critical temperature. In this paper, we detail this point and we report the measurements carried out on thin-film microbridges.…”

Section: Introductionmentioning

confidence: 99%

Josephson modulation of the critical current inYBa2Cu3O7−δfilms

et al. 2008

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Assuming that the boundary planes in YBa 2 Cu 3 O 7−␦ can show a Josephson behavior, we establish the conditions required in epitaxial thin films to observe the modulation of the critical current by an applied magnetic field, as well as the possible forms of the modulated current. We report measurements carried out on two YBa 2 Cu 3 O 7−␦ films in the near vicinity of the critical temperature that show a partial modulation of their critical current. The comparison of the measured critical current changes to those predicted by the calculations shows that the experimental results are consistent with the Josephson modulation of the current carried by associations of weak links located in the boundary planes.

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Vortex dynamics at the transition to the normal state in YBa2Cu3O7−δ films

Cited by 10 publications

References 52 publications

Transport Properties of ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Thin Films Near the Critical State

Transport Properties of ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Thin Films Near the Critical State

What happens in Josephson junctions at high critical current densities

Josephson modulation of the critical current inYBa2Cu3O7−δfilms

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