The impact of artificially created defects nanostructure, formed by implanted dielectric nanoparticles or irradiation defects, on microwave properties of high-Tc superconductor films is analyzed in the framework of phenomenological theory for microwave response of type-II superconductors. We have calculated the surface resistance for such a kind of nanostructured type-II superconductor film and investigated conditions for the emergence of nonlinear response caused by the entrance of microwave-induced vortices in the film's interior through its edges. The obtained results indicate that artificial defect nanostructure in the film's interior formed by point-like or columnar structural defects can significantly improve its microwave characteristics in both the Meissner and mixed states and also increase the threshold for the onset of nonlinear response.
Розглянуто взаємодію фракційних вихорів між собою у двозонному надпровіднику та вперше передбачено можливість дисоціації композитних вихорів Абрикосова із цілим квантом магнетного потоку на фракційні компоненти під впливом високочастотного електромагнетного поля НВЧдіапазону. Проведено чисельні розрахунки для виявлення порогу такої дисоціації як функції амплітуди і частоти НВЧ-струму.Ключові слова: вихор Абрикосова, багатозонні надпровідники, квант магнетного потоку, рівняння Гінзбурга-Ландау, лондонівська вільна енергія.The interaction of fractional vortices with each other in the two-band superconductor is considered, and for the first time the possibility of dissociation of the composite Abrikosov vortices with a whole quantum of magnetic flux into the fractional components under the influence of microwave electromagnetic field is argued. Numerical calculations are performed in order to identify the threshold of such dissociation as a function of the amplitude and frequency of microwave current.
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