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- W2161453363 abstract "We discuss the low-frequency absorption arising from quenched inhomogeneity in the superfluid density ${ensuremath{rho}}_{s}$ of a model superconductor. Such inhomogeneities may arise in a high-${T}_{c}$ superconductor from a wide variety of sources, including quenched random disorder and static charge density waves such as stripes. Using standard classical methods for treating randomly inhomogeneous media, we show that both mechanisms produce additional absorption at finite frequencies. For a two-fluid model with weak mean-square fluctuations $〈(ensuremath{delta}{ensuremath{rho}}_{s}{)}^{2}〉$ in ${ensuremath{rho}}_{s}$ and a frequency-independent quasiparticle conductivity, the extra absorption has oscillator strength proportional to the quantity $〈(ensuremath{delta}{ensuremath{rho}}_{s}{)}^{2}〉/{ensuremath{rho}}_{s},$ as observed in some experiments. Similar behavior is found in a two-fluid model with anticorrelated fluctuations in the superfluid and normal fluid densities. The extra absorption typically occurs as a Lorentzian centered at zero frequency. We present simple model calculations for this extra absorption under conditions of both weak and strong fluctuations. The relation between our results and other model calculations is briefly discussed, and their possible relation to experiment is also discussed." @default.
- W2161453363 created "2016-06-24" @default.
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- W2161453363 date "2003-04-11" @default.
- W2161453363 modified "2023-09-25" @default.
- W2161453363 title "Models for enhanced absorption in inhomogeneous superconductors" @default.
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- W2161453363 doi "https://doi.org/10.1103/physrevb.67.144506" @default.
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