Efimov, V. B. and Ganshin, A. N. and McClintock, Peter V. E. and Kolmakov, G. V. (2006) Experimental study of the nonlinear second sound wave interaction in superfluid 4He. Journal of Low Temperature Physics, 145 (1-4). pp. 155-164. ISSN 0022-2291
We report preliminary results of investigations of the nonlinear second sound wave interaction in a high-quality resonator filled with superfluid 4He. The anomalously large nonlinear coefficient of second sound allows us to observe the formation of higher harmonics while pumping the resonator at a resonant frequency and, in this manner, to study wave energy transfer from the low-frequency domain to the high-frequency domain over a wide frequency range. The observed nonequilibrium stationary wave distribution of amplitudes A f for multiple harmonics over wave frequency f may be described as , where s ≥ 1.5.
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