Anomalous Sound Velocity in Vitreous Silica at Very Low Temperatures

Piché, L.; Maynard, R.; Hunklinger, Siegfried; Jäckle, J.

doi:10.1103/physrevlett.32.1426

Cited by 174 publications

(81 citation statements)

References 13 publications

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“…2). This behaviour is common to rare earth metaphosphate glasses (Senin et ale 1993a(Senin et ale , 1993bFarok et ale 1994;Senin et ale 1994aSenin et ale , 1994b) and many other glasses, including vitreous Si0 2 (Piche et ale 1974;Hunklinger 1982;Raychaudhuri and Hunklinger 1984) crossed polarisers to ensure that the stress was uniform. Ultrasonic experiments under uniaxial stress were carried out at selected temperatures up to 400 K using a Hartwell temperature controller; for the low-temperature experiments down to 77 K a liquid nitrogen cryosat was used.…”

Section: (3a) Soee and Their Temperature Dependencesmentioning

confidence: 99%

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Elastic Behaviour of Terbium Metaphosphate Glasses Under High Pressures

Senin¹,

Sidek²,

Saunders³

1994

Aust. J. Phys.

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The elastic and nonlinear acoustic vibrational properties of terbium metaphosphate glasses (Tb203)x(P205)1-x with x = 0·226, 0·247, 0·263 and 0·271 (x is the mole fraction) have been determined from measurements of the effects of temperature, hydrostatic pressure, and uniaxial stress on' ultrasonic wave velocity. At temperatures below about 140 K, the elastic stiffness C1J of' (Tb203)x(P205)1-x glasses becomes anomalously dependent upon temperature, a behaviour usually associated with interactions between acoustic phonons and two-level systems. Except for the (Tb203)O·271(P20S)O·729 glass, the hydrostatic pressure derivatives (8C1J/8P)T,P=O of the elastic stiffness C1J and also (8B s /8P)T,P=O of the bulk modulus B S of terbium metaphosphate glasses are small and negative. The third-order elastic stiffness tensor components CIJK of the (Tb203)o·247(P20s)o·7s3 glass between 77 K and 400 K have also been determined. At room temperature, Cl12, C123 and C144 are positive while C111, C155 and C456 are negative. Both longitudinal and shear acoustic mode Griineisen parameters are small and negative: the application of pressure softens the long-wavelength acoustic phonon mode frequencies. The mode softening is enhanced as the temperature is reduced.

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Section: (3a) Soee and Their Temperature Dependencesmentioning

confidence: 99%

“…2). This behaviour is common to rare earth metaphosphate glasses ) and many other glasses, including vitreous Si02 Hunklinger 1982;Raychaudhuri and Hunklinger 1984) and Te02 (Benbattouche et al 1989). …”

Section: (3a) Soec and Their Temperature Dependencesmentioning

confidence: 99%

Elastic Behaviour of Terbium Metaphosphate Glasses Under High Pressures

Senin¹,

Sidek²,

Saunders³

1994

Aust. J. Phys.

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“…Since SiNx is the dominant contributor to the membrane tension and determines mechanical resonance frequency, we expect P to reflect the TLS density in SiNx. With M ¼ 0.32 eV, 25 q ¼ 3200 kg/m 3 , and v ¼ 9200 m/s, we estimate P $ 7 Â 10 44 J À1 m À3 . This TLS density measured in an acoustic measurement can also predict TLS-limited SiNx microwave loss.…”

mentioning

confidence: 99%

“…This corresponds to a critical electric field E c % 69 V/m which is consistent with data from superconducting coplanar waveguide resonators. 24 In addition, TLS interacting with phonons changes the speed of sound v over temperature T as 20,25 …”

mentioning

confidence: 99%

Optomechanical effects of two-level systems in a back-action evading measurement of micro-mechanical motion

Suh¹,

Weinstein²,

Schwab³

2013

Applied Physics Letters

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We show that the two-level systems (TLS) in lithographic superconducting circuits act as a power-dependent dielectric leading to non-linear responses in a parametrically coupled electromechanical system. Driven TLS shift the microwave resonance frequency and modulate the mechanical resonance through the optical spring effect. By pumping with two tones in a back-action evading measurement, these effects produce a mechanical parametric instability which limits single quadrature imprecision to 1.4 xzp. The microwave resonator noise is also consistent to a TLS-noise model. These observations suggest design strategies for minimizing TLS effects to improve ground-state cooling and quantum non-demolition measurements of motion.

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“…The temperature dependence of the specific heat, the thermal conductivity and also the sound velocity are the classic examples of such "anomalous" behavior. 1,2 Nevertheless there is great regularity in these properties for many different glasses, and therefore it was thought that this universal behavior must arise from their intrinsic disorder. More than 25 years ago the standard two-level system (TLS) model was proposed to explain the anomalies.…”

Section: Introductionmentioning

confidence: 99%

Ethanol Glass Dynamics: Logarithmic Line Broadening and Optically Induced Dephasing

Lazonder¹,

Duppen

Wiersma

2000

J. Phys. Chem. B

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The time and fluence dependence of the homogeneous line width of Zn-porphin in deuterated ethanol glass at 1.8 K is remeasured by stimulated photon echo. The observed spectral dynamics is interpreted in terms of the standard two-level system model and by using a commonly used modified version of it. It is shown, as was suggested recently (Phys. ReV. B 1997, 56, 11571), that time-dependent local heating is the cause of the plateau found in earlier echo experiments on this system. The anomalous intensity loss of the photon echo in the population dimension, however, is confirmed, as well as the existence of excess optical dephasing on a short time scale. The former effect is attributed to spontaneous frequency jumps outside the laser bandwidth, the latter to spectral diffusion induced by the change of electronic state of the chromophore. This phenomenon is not captured in existing theoretical models, which assume the probe molecule to be just a spectator of glass dynamics.

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Anomalous Sound Velocity in Vitreous Silica at Very Low Temperatures

Cited by 174 publications

References 13 publications

Elastic Behaviour of Terbium Metaphosphate Glasses Under High Pressures

Elastic Behaviour of Terbium Metaphosphate Glasses Under High Pressures

Optomechanical effects of two-level systems in a back-action evading measurement of micro-mechanical motion

Ethanol Glass Dynamics: Logarithmic Line Broadening and Optically Induced Dephasing

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