Attenuation of Second Sound in Superfluid
- 14 February 2000
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 84 (7) , 1515-1518
- https://doi.org/10.1103/physrevlett.84.1515
Abstract
The attenuation of second sound (spin-entropy) wave in the superfluid phase has been measured in magnetic fields up to 11 T and to sufficiently high frequency to observe the bulk attenuation proportional to the square of frequency. The measured attenuation coefficient is compared with the existing theories of hydrodynamics and dissipative coefficients. The resulting “excess” attenuation is discussed in terms of the temperature dependent spin diffusion coefficient in the superfluid.
Keywords
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