Determination of coordinate dependence of a pinning potential from a microwave experiment with vortices
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Title |
Determination of coordinate dependence of a pinning potential from a microwave experiment with vortices
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Creator |
Dobrovolskiy, O.V.
V. A. Shklovskij, V.A. |
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Subject |
Research Subject Categories::NATURAL SCIENCES
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Description |
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 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. |
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Date |
2013-10-04T09:31:31Z
2013-10-04T09:31:31Z 2013-02 |
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Type |
Article
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Identifier |
Fiz. Nizk. Temp. 39, 162–167
http://dspace.univer.kharkov.ua/handle/123456789/9090 |
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Language |
en
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Publisher |
LOW TEMPERATURE PHYSICS
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