Elastic effects of structural relaxation in glasses at low temperatures

Jäckle, J.; Piché, L.; Arnold, W.; Hunklinger, Siegfried

doi:10.1016/0022-3093(76)90119-8

Cited by 276 publications

(98 citation statements)

References 37 publications

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“…This latter mechanism arises because a passing phonon modifies the energy bias of a particular pair of internal states. This causes irreversible thermal equilibration processes within each pair, resulting in energy dissipation (Jäckle et al, 1976;Maynard, 1975). This phenomenon is sometimes referred to as the bulk viscosity (Landau and Lifshitz, 1987).…”

Section: G the Relaxational Absorptionmentioning

confidence: 99%

“…While the relaxational mechanism thus seems to play only a minor role in the phonon absorption at the plateau temperatures, its effects are observable and can explain, as we will argue below, the temperature independent log ω part in the sound speed variation as measured in (Belessa, 1978). According to (Jäckle et al, 1976), the variation in the speed of sound due to a collection of two-level systems is…”

Section: G the Relaxational Absorptionmentioning

confidence: 99%

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The Microscopic Quantum Theory of Low Temperature Amorphous Solids

Lubchenko¹,

Wolynes²

2007

Advances in Chemical Physics

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The quantum excitations in glasses have long presented a set of puzzles for condensed matter physicists. A common view is that they are largely disordered analogs of elementary excitations in crystals, supplemented by two level systems which are chemically local entities coming from disorder. A radical revision of this picture argues that the excitations in low temperature glasses are deeply connected to the energy landscape of the glass when it vitrifies: the excitations are not low excited states built on a single ground state but locally defined resonances, high in the energy spectrum of a solid. According to a semiclassical analysis, the two level systems involve resonant collective tunneling motions of around two hundred molecular units which are relics of the mosaic of cooperative motions at the glass transition temperature Tg. The density of states of the TLS is determined by Tg and the mosaic's length scale, which is a weak function of the cooling rate. The universality of phonon scattering in insulating glasses is explained. The Boson Peak and the plateau in thermal conductivity, observed at higher temperatures, are also quantitatively understood within the picture as arising from the same cooperative motions, but now accompanied by thermal activation of the mosaic's vibrational modes. The dynamics of some of the local structural transitions have significant quantum corrections to the semiclassical picture. These corrections lead to a deviation of the heat capacity and conductivity from the standard tunneling model results and explain the anomalous time dependence of the heat capacity. Interaction between tunneling centers contributes to the large and negative value of the Grüneisen parameter often observed in glasses.

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Section: G the Relaxational Absorptionmentioning

confidence: 99%

Section: G the Relaxational Absorptionmentioning

confidence: 99%

The Microscopic Quantum Theory of Low Temperature Amorphous Solids

Lubchenko¹,

Wolynes²

2007

Advances in Chemical Physics

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“…It is conceivable that "static" structural changes might occur in function of T , and that these could produce a temperature dependent v ∞ (T ). As discussed in [40], if Q −1 is given by a single Debye relaxation,…”

Section: Introductionmentioning

confidence: 99%

Anharmonic versus relaxational sound damping in glasses. I. Brillouin scattering from densified silica

et al. 2005

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This series discusses the origin of sound damping and dispersion in glasses. In particular, we address the relative importance of anharmonicity versus thermally activated relaxation. In this first article, Brillouin-scattering measurements of permanently densified silica glass are presented. It is found that in this case the results are compatible with a model in which damping and dispersion are only produced by the anharmonic coupling of the sound waves with thermally excited modes. The thermal relaxation time and the unrelaxed velocity are estimated.

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“…The study of sound attenuation coefficient of magnetic fluid under an external magnetic fluid implies that the anisotropy in sound propagation is attributed to the two motions of the clusters of the ferrous colloidal particles in the fluid as rotational and translational (Taketomi 1986;Skumiel 2000Skumiel , 2003Skumiel , 2004. The absorption study in glasses show a peak in attenuation at low temperature with change in temperature in simple glasses like silica, GeO 2 , B 2 O 3 , As 2 O 3 etc and in multicomponent glasses (Manghnami1,1974;Jackle, 1976). The change in velocity and attenuation in glasses are attributed to the structural change in glass network.…”

Section: Ultrasonic Attenuation and Velocity In Different Materialsmentioning

confidence: 99%