Low-temperature specific heat and thermal conductivity of glasses

Gil, Laura Zumaquero; Ramos, Miguel; Bringer, A.; Buchenau, U.

doi:10.1103/physrevlett.70.182

Cited by 188 publications

(97 citation statements)

References 24 publications

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“…5 and 6 show the specific heat data of a 50 nm and a 100 nm thick SiN membrane with the corresponding Debye fit plotted versus the temperature. Below 100 K, a deviation from Debye-like specific heat is seen, the specific heat rise is stronger than the Debye T 3 term as already mentioned for glassy materials but at lower temperature 27 . From the Debye specific heat fit using a sound velocity estimated from a mechanical measurement, the Debye temperature is estimated to be θ D =850 K, a value commonly accepted for amorphous SiN membranes 9,28 .…”

Section: B Effect Of a Finite Transducer Widthsupporting

confidence: 55%

Specific heat measurement of thin suspended SiN membrane from 8 K to 300 K using the 3ω-Völklein method

Ftouni

Tainoff

Richard

et al. 2013

Review of Scientific Instruments

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We present a specific heat measurement technique adapted to thin or very thin suspended membranes from low temperature (8 K) to 300 K. The presented device allows the measurement of the heat capacity of a 70 ng silicon nitride membrane (50 or 100 nm thick), corresponding to a heat capacity of 1.4x10 −10 J/K at 8 K and 5.1x10 −8 J/K at 300 K. Measurements are performed using the 3ω method coupled to the Völklein geometry. This configuration allows the measurement of both specific heat and thermal conductivity within the same experiment. A transducer (heater/thermometer) is used to create an oscillation of the heat flux on the membrane; the voltage oscillation appearing at the third harmonic which contains the thermal information is measured using a Wheatstone bridge set-up. The heat capacity measurement is performed by measuring the variation of the 3ω voltage over a wide frequency range and by fitting the experimental data using a thermal model adapted to the heat transfer across the membrane. The experimental data are compared to a regular Debye model; the specific heat exhibits features commonly seen for glasses at low temperature. 1 arXiv:1511.07606v1 [cond-mat.mes-hall]

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Section: B Effect Of a Finite Transducer Widthsupporting

confidence: 55%

Specific heat measurement of thin suspended SiN membrane from 8 K to 300 K using the 3ω-Völklein method

Ftouni

Tainoff

Richard

et al. 2013

Review of Scientific Instruments

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“…3,68,69 The latter (SPM) is cast in terms of a relaxation time τ −1 (x) which can, in turn, be split into three terms using the Matthiesen rule τ …”

Section: A Orientationally Disordered Phasesmentioning

confidence: 99%

Effects of internal molecular degrees of freedom on the thermal conductivity of some glasses and disordered crystals

et al. 2012

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The thermal conductivity κ(T ) of the fully ordered stable phase II, the metastable phase III, the orientationally disordered (plastic) phase I, as well as the nonergodic orientational glass (OG) phase, of the glass former cyclohexanol (C 6 H 11 OH) has been measured under equilibrium vapor pressure within the 2-200 K temperature range. The main emphasis is here focused on the influence of the conformational disorder upon the thermal properties of this material. Comparison of results with those regarding cyanoclyclohexane (C 6 H 11 CN), a chemically related compound, serves to quantify the role played by the terminal groups -OH and -CN on the phonon scattering processes. The picture that emerges shows that motions of such groups do play a minor role as scattering centers, both within the low-temperature orientationally ordered phases as well as in the OG states. The results are analyzed within the Debye-Peierls relaxation time model for isotropic solids comprising mechanisms for long-wave phonon scattering within the OG and orientational ordered low-temperature phases, as well as others arising from localized short-wavelength vibrational modes as pictured by the Cahill-Pohl model. By means of complementary neutron and Raman scattering we show that in the OG state the energy landscapes for both compounds are very similar.

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“…The thermal conductivity of alcohol glasses [6,9,10] was described by the soft potential model (SPM), which was first proposed by Karpov, Klinger and Ignatiev in 1983 to explain the universal properties of various glasses [11] and developed later in [12][13][14][15][16][17]. The model provides a unified description of thermal conductivities of various glasses in a wide range of temperatures.…”

Section: Introductionmentioning

confidence: 99%

Deuteration effects in the thermal conductivity of molecular glasses

Кривчиков

Bermejo

Sharapova

et al. 2011

Low Temperature Physics

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The thermal conductivity κ(T) of pure deuterated ethanol has been measured under its equilibrium vapor pressure in its orientationally-ordered crystal (T = 2 K -T m ), orientational glass and the glass state (T = 2 K -T g , T g is the glass transition temperature) solid phases. The temperature dependence of the conductivity is well described by a sum of two contributions: κ(T) = κ I (T) + κ II (T), where κ I (T) account for the heat transport by acoustic phonons and κ II (T) for the heat transfer by localized high-frequency excitations respectively. The thermal conductivities of deuterated and hydrogenated ethanols are compared in different phases. The phonon scattering mechanisms in the glasses have been analyzed. In the investigated glasses the effect of complete deuteration shows up as a contribution κ II (T).

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Low-temperature specific heat and thermal conductivity of glasses

Cited by 188 publications

References 24 publications

Specific heat measurement of thin suspended SiN membrane from 8 K to 300 K using the 3ω-Völklein method

Specific heat measurement of thin suspended SiN membrane from 8 K to 300 K using the 3ω-Völklein method

Effects of internal molecular degrees of freedom on the thermal conductivity of some glasses and disordered crystals

Deuteration effects in the thermal conductivity of molecular glasses

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