Abstract
The velocity of second soundu 2 in dilute solutions of3He in4He has been measured by a pulse, time-of-flight technique using a new type of mechanical transducer. Tables of measured values ofu 2 as a function of temperature between 0.03 and 0.6° K are presented for3He concentrations in the range 0.14–6.3% at the saturated vapor pressure and under hydrostatic pressures of 10 and 20 atm. Estimates of the upper limit of the intrinsic attenuation of second sound have also been made and these are consistent with theory provided that the experimental values of the phonon thermal conductivity lifetime are used in place of the values calculated by Baym and Ebner.
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Work supported by a grant from the National Science Foundation.
On leave of absence from University of Nottingham, U.K.
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Brubaker, N.R., Edwards, D.O., Sarwinski, R.E. et al. The velocity of second sound in dilute3He-4He solutions below 0.6°K. J Low Temp Phys 3, 619–634 (1970). https://doi.org/10.1007/BF00628338
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DOI: https://doi.org/10.1007/BF00628338