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Please use this identifier to cite or link to this item: http://dspace.univer.kharkov.ua/handle/123456789/9090

Название: Determination of coordinate dependence of a pinning potential from a microwave experiment with vortices
Авторы: Dobrovolskiy, O.V.
V. A. Shklovskij, V.A.
Ключевые слова: Research Subject Categories::NATURAL SCIENCES
Issue Date: Feb-2013
Библиографическое описание: Fiz. Nizk. Temp. 39, 162–167
Краткий осмотр (реферат): The measurement of the complex impedance response accompanied by power absorption P(x) in the radiofrequency and microwave ranges represents a most popular experimental method for the investigation of pinning mechanisms and vortex dynamics in type-II superconductors. In the theory, the pinning potential (PP) well for a vortex must be a priori specified in order to subsequently analyze the measured data. We have theoretically solved the inverse problem at T¼0K and exemplify how the coordinate dependence of a PP can be determined from a set of experimental curves P(xjj0) measured at subcritical dc currents 0<j0<jc under a small microwave excitation j1 jc with frequency x. We furthermore elucidate how and why the depinning frequency xp, which separates the non-dissipative (quasi-adiabatic) and the dissipative (high-frequency) regimes of small vortex oscillations in the PP, is reduced with increasing j0. The results can be directly applied to a wide range of conventional superconductors with a PP subjected to superimposed dc and small microwave ac currents at T Tc.
URI: http://dspace.univer.kharkov.ua/handle/123456789/9090
Appears in Collections:Наукові видання. Фізичний факультет

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