Low-temperature specific heat and thermal conductivity of silica aerogels

T. Sleator; A. Bernasconi; D. Posselt; Jørgen Kjems; H.R. Ott

doi:10.1103/PhysRevLett.66.1070

Low-temperature specific heat and thermal conductivity of silica aerogels

T. Sleator, A. Bernasconi, D. Posselt, Jørgen Kjems, H.R. Ott

Research output: Contribution to journal › Journal article › Research

Abstract

Specific-heat and thermal-conductivity measurements were made on a series of base-catalyzed silica aerogels at temperatures between 0.05 and 20 K. Evidence for a crossover between regimes of characteristically different excitations was observed. The data analysis indicates a "bump" in the density of vibrational states g(omega) at the crossover frequency from phonon to fracton behavior.

Original language	English
Journal	Physical Review Letters
Volume	66
Issue number	8
Pages (from-to)	1070-1073
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.66.1070
Publication status	Published - 1991

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title = "Low-temperature specific heat and thermal conductivity of silica aerogels",

abstract = "Specific-heat and thermal-conductivity measurements were made on a series of base-catalyzed silica aerogels at temperatures between 0.05 and 20 K. Evidence for a crossover between regimes of characteristically different excitations was observed. The data analysis indicates a {"}bump{"} in the density of vibrational states g(omega) at the crossover frequency from phonon to fracton behavior. ",

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year = "1991",

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journal = "Physical Review Letters",

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T1 - Low-temperature specific heat and thermal conductivity of silica aerogels

AU - Sleator, T.

AU - Bernasconi, A.

AU - Posselt, D.

AU - Kjems, Jørgen

AU - Ott, H.R.

PY - 1991

Y1 - 1991

N2 - Specific-heat and thermal-conductivity measurements were made on a series of base-catalyzed silica aerogels at temperatures between 0.05 and 20 K. Evidence for a crossover between regimes of characteristically different excitations was observed. The data analysis indicates a "bump" in the density of vibrational states g(omega) at the crossover frequency from phonon to fracton behavior.

AB - Specific-heat and thermal-conductivity measurements were made on a series of base-catalyzed silica aerogels at temperatures between 0.05 and 20 K. Evidence for a crossover between regimes of characteristically different excitations was observed. The data analysis indicates a "bump" in the density of vibrational states g(omega) at the crossover frequency from phonon to fracton behavior.

KW - Materialers atomare struktur og egenskaber

U2 - 10.1103/PhysRevLett.66.1070

DO - 10.1103/PhysRevLett.66.1070

M3 - Journal article

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VL - 66

SP - 1070

EP - 1073

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

ER -

Low-temperature specific heat and thermal conductivity of silica aerogels

Abstract

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