Microwave Absorption by Vortices in Superconductors with a Washboard Pinning Potential
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Дата
2012
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Intech
Анотація
let us compare the results presented in the chapter with the analogous but more
general results obtained by the authors [25] on the basis of a stochastic model for arbitrary
temperature T and densities j0 and j1. In that work, the Langevin equation (1), supplemented
with a thermofluctuation term, has been exactly solved for γ = 1 interms ofamatrix continued
fraction [52] and, depending on the WPP’s tilt caused by the dc current, two substantially
differentmodes in the vortexmotion have been predicted. Inmore detail, at low temperatures
and relatively high frequencies in a nontilted pinning potential each pinned vortex is confined
to its pinning potential well during the ac period. In the case of superimposed strong ac and
dc driving currents a running state of the vortex may appear when it can visit several (or
many) potential wells during the ac period. As a result, two branches of new findings have
been elucidated [25, 27]. First, the influence of an ac current on the usual E0(j0) and ratchet
E0(j1) CVCs has been analyzed. Second, the influence of a dc current on the ac nonlinear
impedance response and nonlinear power absorption has been investigated. In particular,
the appearance of Shapiro-like steps in the usual CVC and the appearance of phase-locking
regions in the ratchet CVC has been predicted. At the same time, it has been shown that
an anomalous power absorption in the ac response is expected at close-to critical currents
j0 jc and relatively low frequencies ω ωp. Figure 8 shows the main predictions of
these works. Namely, predicted are (i) an enhanced power absorption at low frequencies,
(ii) a temperature- and current-dependent minimum at intermediate frequencies. (iii) At
substantially low temperatures, the absorption can acquire negative values which physically
corresponds to the generation by vortices. However, a more general and formally precise
solution of the problem in terms of a matrix-continued fraction does not allow the main
physical results of the problemto be investigated in the formof explicit analytical functions of
the main physical quantities (j0, j1, ω, α, T,
, and γ) which, we believe, has helped us greatly
to elucidate the physics in the problem under consideration.
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Research Subject Categories::NATURAL SCIENCES
Бібліографічний опис
Superconductors – Materials,Properties and Applications,Charter 11,pp. 263-288