Download e-book for iPad: 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 used to be first convincingly proven that less than 1 okay the ther­ mal conductivity and the warmth capability of amorphous solids behave in a manner that is strikingly diverse to that of crystalline solids. for the reason that that point there was a wide selection of experimental and theoretical reports 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 prompt by way of older acoustic and thermal experiments (extending as much as a hundred K). The curiosity during this just a little limited department of physics lies to a substantial quantity within the proven fact that the variations have been so unforeseen. it would be notion that because the tempera­ ture, probing frequency, or extra often the power decreases, a continuum de­ scription during which structural variations among glass and crystal are hid should still turn into extra actual. In a feeling this can be real, however it appears to be like that there exists in an amorphous good a wide density of extra excitations that have no counterpart in basic crystals. This booklet offers a survey of the big variety of experimental investigations of those low power excitations, including a re­ view of many of the theoretical types recommend to provide an explanation for their lifestyles and nature.

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Brodsky, A. Lurio: Phys. Rev. E. H. L. I. Nathan, A. Pincuk: Phys. Rev. Lett. E. H. L. I. Nathan: In Proc. 2nd Int. Conf. on Light Scattering in Solids, ed. by M. 5 P. Dean: Rev. Mod. Phys. J. Bell: Rep. Prog. Phys. T. J. Thouless: J. Phys. 8 D. Henderson: In Computational Solid State Physics, ed. by F. M. Martin: Phys. Rev. E. Meek: Philos. Mag. 11 R. Alben, D. E. H. Brodsky: Phys. Rev. 12 D. Weaire, R. Alben: Phys. Rev. Lett. F. Thorpe: In Amorphous and Liquid Semiconductors, ed. by J. Stuke and W.

Apparently, the crystallization removes the low-temperature anomaly; to be precise: the experimental data allow placing an upper limit of c1 ~ 10 erg/g K2 on the linear anomaly. The hump at T/e ~ 3 x 10-2 has been correlated with the soft transverse acoustic mode in cristobalite.

1). although in certain materials a different power law definitely prevails at low temperature. In all other materials where this anomaly has not been seen to date. the upper 'limits put on the linear term (c 1 ) in these experiments have always been larger than the linear terms actually observed in some glasses. The important question remains: Is the anomaly an intrinsic property of the amorphous state. or is it extrinsic? If it is extrinsic. it appears to be far more difficul t to prevent from occurring than extrinsic specific heat anomal ies in crystalline solids.

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