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Second-sound attenuation very near T_λ is found to be proportional to the square of the frequency, and the damping diverges as (T_λ-T)^-σ, σ=0.34±0.06, in agreement with dynamic scaling. The coefficient of the damping is consistent with recent estimates of the coherence length.
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J. A. Tyson (1968) studied this question.
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