Abstract
We have developed a theory, valid for arbitrary frequencies, to calculate the change in the velocity and damping of sound due to fluctuations of the order parameter just above the superfluid transition temperature in liquid 3He. While the theory is approximate, it gives the exact high-frequency limit and is off the exact low-frequency limit by less than 0.5%. We show that careful measurements on the frequency dependence of the fluctuation contribution should allow one to obtain information on the nature of quasiparticle interactions in the normal liquid.
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Pal, A., Bhattacharyya, P. Fluctuation contribution to the velocity and damping of sound in liquid 3He above the superfluid transition temperature. J Low Temp Phys 37, 379–387 (1979). https://doi.org/10.1007/BF00119195
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DOI: https://doi.org/10.1007/BF00119195