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      Frequency-dependent ratchet effect in superconducting films with a tilted washboard pinning potential

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          Abstract

          The influence of an ac current of arbitrary amplitude and frequency on the mixed-state dc-voltage-ac-drive ratchet response of a superconducting film with a dc current-tilted uniaxial cosine pinning potential at finite temperature is theoretically investigated. The results are obtained in the single-vortex approximation, i.e., for non-interacting vortices, within the frame of an exact solution of the appropriate Langevin equation in terms of a matrix continued fraction. Formulas for the dc voltage ratchet response and absorbed power in ac response are discussed as functions of ac current amplitude and frequency as well as dc current induced tilt in a wide range of corresponding dimensionless parameters. Special attention is paid to the physical interpretation of the obtained results in adiabatic and high-frequency ratchet responses taking into account both running and localized states of the (ac+dc)-driven vortex motion in a washboard pinning potential. Our theoretical results are discussed in comparison with recent experimental work on the high-frequency ratchet response in nanostructured superconducting films [B. B. Jin et al., Phys. Rev. B 81 (2010) 174505].

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          Unified theory of effects of vortex pinning and flux creep upon the rf surface impedance of type-II superconductors

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            Effect of Microwaves on Josephson Currents in Superconducting Tunneling

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              Dependence of magnetic penetration depth on the thickness of superconducting Nb thin films

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                Author and article information

                Journal
                2011-06-30
                Article
                10.1103/PhysRevB.84.054515
                1106.6198
                bb4f9e7f-f835-421f-8254-11e4a9d57857

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                Phys Rev. B 84 (2011) 054515
                13 pages, 11 figures
                cond-mat.supr-con

                Condensed matter
                Condensed matter

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