Threefold reduction in thermal conductivity of Vycor glass due to adsorption of liquid 4He

Z. G. Cheng, M. H.W. Chan

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We report thermal conductivity measurements of porous Vycor glass when it is empty and when the pores are filled with helium between 0.06 and 0.5 K. The filling of liquid 3He and liquid 4He inside the Vycor pores brings about two to three-fold reduction of the thermal conductivity as compared with empty Vycor. This dramatic reduction of thermal conductivity, not seen with solid 3He and 4He in the pores, is the consequence of hydrodynamic sound modes in liquid helium that greatly facilitate the quantum tunneling of the two-level systems in Vycor and enhance the scattering of the thermal phonons in the silica network.

Original languageEnglish (US)
Article number063030
JournalNew Journal of Physics
Volume15
DOIs
StatePublished - Jun 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Threefold reduction in thermal conductivity of Vycor glass due to adsorption of liquid <sup>4</sup>He'. Together they form a unique fingerprint.

Cite this