Measurement of the superfluid density in silica aerogels

P. A. Crowell, G. K S Wong, J. D. Reppy

Research output: Contribution to journalArticlepeer-review


We have conducted torsional oscillator measurements of the superfluid density in 4He-filled aerogel where the aerogel density is 0.20g/cc. The superfluid densiyy ρ{variant}s is observed to obey a power-law ρ{variant}s=ρ{variant}sotξ over a reduced temperature range 10-4.3 <t<10-1.8 with rms deviations of less than 2 percent. The exponent ξ is 0.812±0.004. This value is remarkably close to the exponent, 0.813±0.009, reported earlier for an aerogel sample of density 0.13g/cc.

Original languageEnglish (US)
Pages (from-to)549-550
Number of pages2
JournalPhysica B: Physics of Condensed Matter
Issue numberPART 1
StatePublished - Aug 1990

Bibliographical note

Funding Information:
The work reported here was supported by the National Science Foundation through grant NSF-tRlR84-18605 and by the Cornell Material Science Center through grant NSF-tUR85-16616-A02, MSC Report 6901.

Funding Information:
P.A.C. acknowledges the support of an AT&T Bell Laboratories Ph.D Scholarship. G.K.S.W. acknowledges the support of an A.D. White Fellowship from Cornell University and a 1967 Postgraduates Fellowship from the Natural Sciences and Engineering Research Council of Canada.


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