Fourth Sound Measurement of Superfluid 3He in Aerogel

The fourth sound resonance experiment has been done on liquid 3He in 98.5% porosity aerogel. Aerogel was grown inside the pores among the sintered silver powder to avoid the vibration of the aerogel strands by the sound experiment. The measurement was performed at zero magnetic field and 27 bar. We...

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Bibliographic Details
Published inJournal of low temperature physics Vol. 148; no. 5-6; pp. 597 - 601
Main Authors Nago, Y., Obara, K., Kado, R., Yano, H., Ishikawa, O., Hata, T.
Format Journal Article
LanguageEnglish
Published New York Springer Nature B.V 01.09.2007
Subjects
Aerogels
Fluids
Low temperature physics
Phase transitions
Porosity
Sintering (powder metallurgy)
Sound
Superfluidity
Vibration measurement
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Summary:The fourth sound resonance experiment has been done on liquid 3He in 98.5% porosity aerogel. Aerogel was grown inside the pores among the sintered silver powder to avoid the vibration of the aerogel strands by the sound experiment. The measurement was performed at zero magnetic field and 27 bar. We observed the phase transition between the A-like and B-like phases and also their coexistent state. The A-like to B-like phase transition occurs not at a temperature but within a temperature band. In this band, the A-like phase gradually converts to the B-like phase. Possible picture of the coexistent state is discussed.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-007-9455-1