Noise-Assisted Microwave Up-conversion by Vortices in Thin-Film Superconductors with a dc-Biased Washboard Pinning Potential

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dc.contributor.authorShklovskij, V.A.
dc.contributor.authorDobrovolskiy, O.V.
dc.contributor.authorHuth, M.
dc.date.accessioned2013-10-04T10:05:40Z
dc.date.available2013-10-04T10:05:40Z
dc.date.issued2012-12-20
dc.description.abstractSo far the main theoretical basis for understanding and optimization of the microwave properties of vortices in type II superconductors has been relying upon the Coffey–Clem (CC) approach for the linear impedance at nonzero temperature. However, the CC model does not account for the non-linear response and the possibility to control it by changing the value of the dc transport current in a superconducting sample. For this reason, we have exactly solved the Langevin equation for the two-dimensional nonlinear vortex dynamics in a dc bias-tilted cosine pinning potential in the presence of an ac current of arbitrary amplitude and frequency ω and have, thereby, substantially generalized the CC results. In this work we analyze the behavior of the non-linear response on kω-frequency in a wide range of dc and ac current densities, ω, and temperature. The kω- response is found to depend strongly on all these parameters, as exemplified for the third-harmonic (k = 3) transformation coefficient Z3. The parametric window for the most enhanced up-conversion is presented. The predicted effects can be experimentally verified in thin-film superconductors with some pinning potential of the washboard type.ru_RU
dc.description.sponsorshipInstitute for Theoretical Physics, NSC-KIPT, Kharkov,Ukraine Department of Physics, Kharkiv National University, Kharkov, Ukraine Physikalisches Institut, Goethe-Universität, Frankfurt am Main, Germanyru_RU
dc.identifier.citationJ Supercond Nov Magn (2013) 26:2079–2083 DOI 10.1007/s10948-012-1946-xru_RU
dc.identifier.urihttps://ekhnuir.karazin.ua/handle/123456789/9092
dc.language.isoenru_RU
dc.publisherSpringer Science+Business Media New York 2012ru_RU
dc.subjectResearch Subject Categories::NATURAL SCIENCESru_RU
dc.subjectMicrowave up-conversion · Non-linear impedance · Washboard pinning potential · Generation of higher harmonicsru_RU
dc.titleNoise-Assisted Microwave Up-conversion by Vortices in Thin-Film Superconductors with a dc-Biased Washboard Pinning Potentialru_RU
dc.typeArticleru_RU

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