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      Vortex ratchet reversal in an asymmetric washboard pinning potential subject to combined dc and ac stimuli

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          Abstract

          The mixed-state resistive response of a superconductor thin film with an asymmetric washboard pinning potential subject to superimposed dc and ac currents of arbitrary amplitudes and frequency at finite temperature is theoretically investigated. The problem is considered in the single-vortex approximation, relying upon the exact solution of the Langevin equation in terms of a matrix continued fraction. The dc voltage response and the absorbed power in ac response are analyzed as functions of dc bias, ac current amplitude and frequency, in a wide range of corresponding dimensionless parameters. Predictions are made of (i) a reversal of the rectified voltage at small dc biases and strong ac drives and (ii) a non-monotonic enhancement of the absorbed power in the nonlinear ac response at far sub-depinning frequencies. It is elucidated how and why both these effects appear due to the competition of the fixed internal and the tunable, dc bias-induced external asymmetry of the potential as the only reason. This is distinct from other scenarios used for explaining the vortex ratchet reversal effect so far.

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          Author and article information

          Journal
          2013-12-06
          Article
          10.1088/0953-8984/26/2/025703
          1312.1877
          2c32bcd9-d4ac-4c54-8fe4-0987ba622d64

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

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          Custom metadata
          J. Phys.: Condens. Matter 26 (2014) 025703
          12 pages, 9 figures
          cond-mat.supr-con cond-mat.mes-hall

          Condensed matter,Nanophysics
          Condensed matter, Nanophysics

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