Phonon and roton propagation in He II under pressure

Dynes, R. C. ; Narayanamurti, V. ; Andres, K. (1973) Phonon and roton propagation in He II under pressure Physical Review Letters, 30 (22). pp. 1129-1132. ISSN 0031-9007

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We have studied the transition from second sound to ballistic phonon flow in He II up to pressures of 24 bar. At saturated vapor pressure the phonon-phonon scattering rate Tpp-1≅1.7×106T3 sec-1 for T<0.6 K. At 24 bar, Tpp-1<8×104 sec-1 for T<0.7 K. The phonon-roton scattering rate Tpr-1 is ~106 sec-1 at 0.75 K and almost pressure independent. At 24 bar between 0.4 and 0.7 K, in addition to ballistic phonons, we observe a second pulse traveling at 16 m/sec, which we believe is the propagation of interacting rotons.

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