Abstract
We have performed an experimental study of the generation and detection of second sound in4He using vibrating superleak second sound transducers. At temperatures well belowT λ and for low driving amplitudes, the magnitude of the generated second sound wave is proportional to the drive amplitude. However, nearT λ and for high drive amplitudes this is no longer the case—instead, the second sound amplitude saturates. In this regime we also find that overtones of the drive frequency are generated. Our results suggest that this behavior is due to critical velocity effects in the pores of the superleak in the generator transducer. This type of measurement may prove to be a useful way in which to study critical velocity effects in confined geometries.
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Giordano, N. Dissipation in vibrating superleak second sound transducers. J Low Temp Phys 59, 247–267 (1985). https://doi.org/10.1007/BF00683778
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DOI: https://doi.org/10.1007/BF00683778