LOW-TEMPERATURE SPECIFIC-HEAT AND THERMAL-CONDUCTIVITY OF SILICA AEROGELS

被引：18

作者：

SLEATOR, T ^{[1
]}

BERNASCONI, A ^{[1
]}

POSSELT, D ^{[1
]}

KJEMS, JK ^{[1
]}

OTT, HR ^{[1
]}

机构：

[1] RISO NATL LAB,DEPT PHYS,DK-4000 ROSKILDE,DENMARK

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 66卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.66.1070

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：1070 / 1073

页数：4

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