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Quantization of Electromagnetic Modes in a Hyperbolic Negative-Index Layered Superconductor Slab

100%
Cortés-López S., Pérez-Rodríguez F.
Acta Physica Polonica A
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2016
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vol. 130
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issue 2
641-644
EN
We theoretically study the infrared reflectivity and transmissivity of a high-temperature layered superconductor slab. Both infrared spectra exhibit very narrow Fabry-Perot resonances associated with the quantization of the wave vector of the TM electromagnetic modes. The resonances are observed in a pass band where the refractive index of the layered superconductor is negative. The pass band of negative dispersion is above the Josephson plasma frequency which appears in the expression for the effective permittivity component, corresponding to the direction perpendicular to the layers. It was found that the Fabry-Perot resonances undergo a blue shift as the slab thickness or the angle of incidence are increased. Moreover, the quantized electromagnetic modes turn out to be quasi-longitudinal because of the strong anisotropy of the infrared dielectric response of the layered superconductor.
2
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Stability of Bilayer Superconductors against Thermomagnetic Avalanche

71%
Vasiliev S., Chumak O., Chabanenko V., Pérez-Rodríguez F., Nabiałek A.
Acta Physica Polonica A
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2014
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vol. 126
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issue 4a
A-84-A-88
EN
The problem of stability of bilayer type II superconductor with different critical current densities of inner part and coating was considered. The optimum thickness of surface layer enabling the maximal increase of the field of first flux jump was found. The field of instability for such bilayer structure was calculated for NbTi superconductor. An increase of the field of the first flux jump by about 60% has been found for optimal coating thickness.
3
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Obtaining a Rough Flux Front in Type-II Superconductors Using a Critical State Model

61%
Romero-Salazar C., Hernández-Flores O., Chabanenko V., Kuchuk E., Abaloszewa I., Nabialek A., Pérez-Rodríguez F.
Acta Physica Polonica A
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2016
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vol. 130
|
issue 2
645-648
EN
In this work we numerically modelled a periodic magnetic flux pattern which qualitatively reproduces the so-called sand avalanches scenario in type-II superconductors. To model these sand-pile patterns we consider a perturbation on the critical current which, as a first approximation, follows a periodic function which depends on the position.
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