THERMODYNAMIC PROPERTIES OF VYCOR AT LOW-TEMPERATURES - EVIDENCE FOR AN ENHANCED CONTRIBUTION OF TUNNELING SYSTEMS

Authors
NITTKE A ESQUINAZI P BURIN A
Citation
A. Nittke et al., THERMODYNAMIC PROPERTIES OF VYCOR AT LOW-TEMPERATURES - EVIDENCE FOR AN ENHANCED CONTRIBUTION OF TUNNELING SYSTEMS, Physical review. B, Condensed matter, 58(9), 1998, pp. 5374-5377
Citations number
26
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
58
Issue
9
Year of publication
1998
Pages
5374 - 5377
Database
ISI
SICI code
0163-1829(1998)58:9<5374:TPOVAL>2.0.ZU;2-S
Abstract
We have measured the heat release and specific heat of Vycor glass at T<1 K. For a charging temperature of 1 K the heat release shows a lit time dependence and is approximately ten times larger than for bulk a- SiO2, in agreement with the specific heat. This result indicates an en hanced density of states of tunneling systems. Our findings cast some doubts on the current interpretation of the enhancement of the thermod ynamic properties of aerogels in terms of fractals.