Strain interactions and the low-temperature properties of glasses

Klein, Michael W.; Fischer, Baruch; Anderson, A. C.; Anthony, P. J.

doi:10.1103/physrevb.18.5887

Cited by 83 publications

(20 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most promising ideas involve the role of interactions between TLS, which had been ignored in the Tunneling Model. Soon after it was reported that amorphous solids appear to have very similar anomalous thermal properties at low temperatures, 8 Klein et al 9 speculated that strain-mediated interactions between the tunneling entities could be responsible for this similarity. By comparing many amorphous solids, Freeman and Anderson 10 found that the tunneling strength Cϭ P ␥ 2 /v 2 rather than the spectral density P was the quantity that varied least between amorphous solids (␥-coupling of TLS to phonons; -mass density; v-speed of sound͒, as had been noted previously by Hunklinger et al 11 Freeman and Anderson argued that the universality of this combination of parameters was an indication of the role of strain-mediated interactions between TLS.…”

Section: Introductionmentioning

confidence: 99%

Low-energy lattice vibrations of porous silica glass

Watson

Pohl

2003

Phys. Rev. B

View full text Add to dashboard Cite

Internal friction, speed of sound, and thermal conductivity of Vycor glass with porosities ranging from 29% to 36% have been measured from 65 mK to 300 K. The results have been compared with those obtained on bulk amorphous silica in order to understand how the porous structure affects the low-energy tunneling states. Contrary to specific-heat results reported previously on Vycor, our measurements indicate that these changes are surprisingly small. Our findings agree qualitatively with the results reported previously on sol-gel porous glass with a similar porosity, and also on aerogels, which are even more highly porous than Vycor. Analysis of the porous silica data suggests that the porosity has very little influence on the spectral density of the tunneling defects, while their coupling energy to the phonons scales with the speed of sound. The excitations observed in specific heat, however, appear to be different from those observed in the acoustic and thermal-conductivity experiments.

show abstract

Section: Introductionmentioning

confidence: 99%

Low-energy lattice vibrations of porous silica glass

Watson

Pohl

2003

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Let the positions of the particles in the two wells be left ( L ) and right ( R ). The tunneling particles in the cluster interact via a weak potential U which may have its origin, for example, from either a strain-strain interaction having the form U ~ A / r 3 (dipole-dipole interaction) [29, 68], where r is the distance between a pair of tunneling particles either in the L or R well and A is a constant, or it could be due to electrostatic dipole-dipole interaction. The tunneling of the particle in one 2LS from L to R (or vice versa) influences, via the interaction, the particle in the other 2LS, forcing it to jump into the free well.…”

mentioning

confidence: 99%

Multilevel Tunnelling Systems and Fractal Clustering in the Low‐Temperature Mixed Alkali‐Silicate Glasses

Jug

Paliienko

2013

The Scientific World Journal

View full text Add to dashboard Cite

The thermal and dielectric anomalies of window-type glasses at low temperatures (T < 1 K) are rather successfully explained by the two-level systems (2LS) standard tunneling model (STM). However, the magnetic effects discovered in the multisilicate glasses in recent times, magnetic effects in the organic glasses, and also some older data from mixed (SiO2)1−x(K2O)x and (SiO2)1−x(Na2O)x glasses indicate the need for a suitable extension of the 2LS-STM. We show that—not only for the magnetic effects, but also for the mixed glasses in the absence of a field—the right extension of the 2LS-STM is provided by the (anomalous) multilevel tunnelling systems (ATS) proposed by one of us for multicomponent amorphous solids. Though a secondary type of TS, different from the standard 2LS, was invoked long ago already, we clarify their physical origin and mathematical description and show that their contribution considerably improves the agreement with the experimental data. In spite of dealing with low-temperature properties, our work impinges on the structure and statistical physics of glasses at all temperatures.

show abstract

“…This may be taken as evidence that random stresses alone cannot lead to a saturation of the tunneling strength within the universal range, and that another mechanism is needed, e.g. interaction between the CN Ϫ quadrupoles, as has been discussed by Sethna and Chow, 43 based on quadrupolar interactions first suggested by Klein et al 10 For the saturation of the tunneling strength in FIG. 14.…”

Section: Discussionmentioning

confidence: 78%

Tunneling states in strained alkali-halide crystals containingCN−ions

Topp

Pohl

2002

Phys. Rev. B

View full text Add to dashboard Cite

Torsional oscillators (ϳ90 kHz) have been used between 0.06 and 100 K to study low-energy excitations in strained alkali-halide hosts doped with KCN in the concentration range from 0.2 to 5 mol %. The tunneling model, originally developed to describe the low-temperature thermal and elastic anomalies in amorphous solids, has been found to describe our data very well. From the observation that the tunneling strength varies linearly with the KCN concentration, we conclude that random internal stresses in the hosts, rather than interactions between the dopant ions, lead to the tunneling states. Implications for the origin of the tunneling states in amorphous solids and in highly disordered crystals, and also for their universality are considered.

show abstract

Strain interactions and the low-temperature properties of glasses

Cited by 83 publications

References 17 publications

Low-energy lattice vibrations of porous silica glass

Low-energy lattice vibrations of porous silica glass

Multilevel Tunnelling Systems and Fractal Clustering in the Low‐Temperature Mixed Alkali‐Silicate Glasses

Tunneling states in strained alkali-halide crystals containingCN−ions

Contact Info

Product

Resources

About