Vibrating quartz crystal studies of wall-film superfluidity in liquid 3He/4He mixtures near the tricritical concentration

We are using a thin quartz crystal immersed in the liquid, vibrating in shear modes at 24.8 and 94.0 MHz, to investigate the onset and growth of superfluidity in a thin film at the crystal surface in liquid 3He/4He mixtures having 3He mole fractions x near the tricritical value x = 0.675. A parallel...

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Published inJournal of low temperature physics Vol. 134; no. 1-2; pp. 707 - 712
Main Authors Andersson, B J, Deng, W, Lee, J, McCoy, B K, Zimmermann, W
Format Journal Article
LanguageEnglish
Published 01.01.2004
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Summary:We are using a thin quartz crystal immersed in the liquid, vibrating in shear modes at 24.8 and 94.0 MHz, to investigate the onset and growth of superfluidity in a thin film at the crystal surface in liquid 3He/4He mixtures having 3He mole fractions x near the tricritical value x = 0.675. A parallel-plate capacitor in the cell monitors the phase-separation transition. Preliminary measurements of frequency shifts at x = 0.644 and x = 0.705 show a relatively abrupt onset of wall-film superfluidity in the bulk normal region of the phase diagram at temperatures in good agreement with earlier studies of wall-film superfluidity by other methods.
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ISSN:0022-2291