Attenuation of second sound in superfluid 3He-A1
The attenuation of second sound (spin-entropy) wave in the superfluid A1 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.
Sato
T
Serin Physics Laboratory, Rutgers University, Piscataway, New Jersey 08854, USA.
Coleman
JJ
de Vegvar PG
Kojima
H
Okuda
Y