Diffusion wave modes and oscillating motions in superfluid $He^3-A$

Details Diffusion wave modes and oscillating motions in superfluid $He^3-A$ Diffusion wave modes and oscillating motions in superfluid $He^3-A$

2007-02-08

arxiv.org/abs/cond-mat/0702208v1

Sov. J. Low Temp. Phys. 17 (1991) 19-23

Physics

Condensed Matter

Soft Condensed Matter

15 pages

Scientific paper

Diffusion vibrational modes are studied in superfluid $He^3-A$ in zero magnetic fields for different angles between the orbital axis and the wave vector. The dispersion relation for these modes is found to depend on the wave polarization. It is shown that in addition to the normal component velocity, the superfluid component velocity also oscillates in the diffusion modes of $He^3-A$. The frictional forces due to viscous waves in $He^3-A$, exerted in the plane surface which is in contact with a superfluid liquid layer of finite thickness and performs a simple harmonic oscillatory motion, are calculated. We also consider, volume of $He^3-A$ restricted by two parallel infinite surfaces, when the lower surface accomplishes simple harmonic oscillation and we calculate the frictional forces exerted on surfaces. It is found that the frictional force has not only parallel, but also a perpendicular component relative to the direction of oscillations.

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