Amorphous Solids: Low-Temperature Properties by W. A. Phillips (auth.), W. Andrew Phillips Ph.D. (eds.)

By W. A. Phillips (auth.), W. Andrew Phillips Ph.D. (eds.)

It is now ten years because it was once first convincingly proven that less than 1 ok the ther­ mal conductivity and the warmth ability of amorphous solids behave in a fashion that's strikingly various to that of crystalline solids. when you consider that that point there was a large choice of experimental and theoretical stories that have not just outlined and clarified the low temperature challenge extra heavily, yet have additionally associated those transformations among amorphous and crystalline solids to these instructed through older acoustic and thermal experiments (extending as much as a hundred K). The curiosity during this a bit constrained department of physics lies to a substantial quantity within the undeniable fact that the variations have been so unforeseen. it would be inspiration that because the tempera­ ture, probing frequency, or extra mostly the strength decreases, a continuum de­ scription within which structural alterations among glass and crystal are hid may still develop into extra actual. In a feeling this is often actual, however it appears to be like that there exists in an amorphous good a wide density of extra excitations that have no counterpart in general crystals. This ebook offers a survey of the wide variety of experimental investigations of those low strength excitations, including a re­ view of many of the theoretical versions recommend to provide an explanation for their lifestyles and nature.

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F. Thorpe: Phys. Rev. D. Joannopoulos, F. Yndurain: Phys. Rev. H. Brodsky, M. J. Cuomo: Phys. Rev. 22 D. C. 4, ed. K. A. L. Galeener, G. Lucovsky: Phys. Rev. Lett. 24 W. J. Shevchik, M. Cardona: Phys. Status Solidi B59, 241 (1973) 3. Low Temperature Specific Heat of Glasses * R. O. Pohl With 17 Figures One of the puzzles presented by amorphous solids is that their low-temperature specific heat exceeds that predicted on the basis of the Oebye theory by a considerable amount. This phenomenon appears to be sufficiently general to be considered a characteristic one.

TAIT argued, however, that it would be difficult to explain \~hy the density of states would be the same in Cabosil and in Vycor, since the latter substance is formed by interconnected silica fipers which are likely to be bound far more tightly than the particles in the pressed powder. For this reason, one would expect the force constants and the density of states dn(~wparticle)/d(~wparticle) to be quite different in the two cases. Consequently, TAIT concluded, this mechanism als offers no satisfactory explanation for the anomalous specific heat.

KNot availa~e since b (column 10) is not known (because vOeb is not known). ldO. 3 CaK(N0 3 )3 GE No. 7031 d varnish Pyroceram 82°3 Se Polymethylmethacryl ate Polystyrene Lexan f Ge0 2 As 2S3 Si0 2-Spectrosil 3Si0 2·Na 2O Corning gode No. 7740 Corning code No. 9700c Material Table 3,1. 8) where the constants a and y depend only slightly on the model. 8, and for intermediate number of levels, a and y have intermediate values. 1 list the values of a and b calculated for two-level states. 3K. Columns 12 and 13 refer to the thermal conductivity which is discussed in a different chapter.

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