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      Analytical prediction of logarithmic Rayleigh scattering in amorphous solids from tensorial heterogeneous elasticity with power-law disorder

      1 , 2 , 3 , 4 , 1 , 2 , 3 , 4 , 5

      Soft Matter

      Royal Society of Chemistry (RSC)

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          Abstract

          A tensorial replica-field theory is developed to solve the elastic wave scattering problem in amorphous solids, which leads to the logarithmic correction to the Rayleigh scattering law.

          Abstract

          The damping or attenuation coefficient of sound waves in solids due to impurities scales with the wavevector to the fourth power, also known as Rayleigh scattering. In amorphous solids, Rayleigh scattering may be enhanced by a logarithmic factor although computer simulations offer conflicting conclusions regarding this enhancement and its microscopic origin. We present a tensorial replica field-theoretic derivation based on heterogeneous or fluctuating elasticity (HE), which shows that long-range (power-law) spatial correlations of the elastic constants, is the origin of the logarithmic enhancement to Rayleigh scattering of phonons in amorphous solids. We also consider the case of zero spatial fluctuations in the elastic constants, and of power-law decaying fluctuations in the internal stresses. Also in this case the logarithmic enhancement to the Rayleigh scattering law can be derived from the proposed tensorial HE framework.

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          Theory of Elasticity

           Lifshitz (1986)
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            Author and article information

            Contributors
            Journal
            SMOABF
            Soft Matter
            Soft Matter
            Royal Society of Chemistry (RSC)
            1744-683X
            1744-6848
            August 26 2020
            2020
            : 16
            : 33
            : 7797-7807
            Affiliations
            [1 ]Cavendish Laboratory
            [2 ]University of Cambridge
            [3 ]CB3 0HE Cambridge
            [4 ]UK
            [5 ]Department of Physics “A. Pontremoli”
            Article
            10.1039/D0SM00814A
            © 2020

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