Fifth Sound in Superfluid ${}^{4}{He}$ and ${}^{3}{He}$ - ${}^{4}{He}$ Mixtures

Publisher Website

7 May 1979

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 42 (19) , 1282-1285
https://doi.org/10.1103/physrevlett.42.1282

Abstract

A new thermal mode, fifth sound, has been observed in a superleak partially filled with superfluid helium. The velocity of the mode in

{}^{4}{He}

and

{}^{3}{He}

-

{}^{4}{He}

mixtures is in good agreement with the theoretical value

{c_{5}}^{2} = (\frac{ρ_{n}}{ρ}) {c_{2}}^{2}

. The index of refraction is found to be a strong function of the fractional filling of the superleak.

Keywords

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