On the experimental value of the intrinsic angular momentum of the A-phase of superfluid helium-3

A simple relation between the equilibrium spin and orbital angular momenta of the superfluid phases of helium-3 close to T_c has been obtained. The intrinsic angular momentum of the A-phase has been found from the existing experimental data using this relation.     

Low-temperature effective electromagnetism in superfluid 3He-A

A general low-temperature effective action for the order parameter in the superfluid phase A of helium 3 is derived. In a symmetric case, when the Fermi velocity equals the transverse velocity of low energy fermionic quasiparticles, the action is the standard relativistic electromagnetic action.     

Flow-induced soliton lattice in superfluid 3He-A

It is shown that in the presence of superflow, υ_s, parallel to a strong magnetic field H (|H| ? 20 Oe), the uniform texture becomes unstable againts the formation of a one dimensional soliton lattice forυ_s ? υ_c2 (≈1 mm/s). The period of the resulting soliton lattice as well as the related NMR frequencies are determined as functions of υ_s.     

Abelian Chern-Simons term in superfluid 3He-A

We show in this paper that an Abelian Chern-Simons term is induced in (2 + 1)- and (3 + 1)-dimensional rotating superfluid ³He-A and that it plays an important role in its dynamics. Because U(1) symmetry is spontaneously broken in ³He-A, a Goldstone mode appears and contributes to the induced Chern-Simons term. We found that the coefficient of the Chern-Simons term, which is equivalent to Hall conductance, depends on an infra-red cut-off of the Goldstone mode, and that the orbital angular momentum of ³He-A in a cylinder geometry is derived from the Chern-Simons term.     

Random anisotropy disorder in superfluid 3He-A in aerogel

Anisotropic superfluid ³He-A in aerogel provides an interesting example of a system with continuous symmetry in the presence of random anisotropy disorder. Recent NMR experiments allow us to discuss two regimes of the orientational disorder that have different NMR properties. One of them, the (c) state, is identified as the pure Larkin-Imry-Ma state. The structure of another state, the (f) state, is not very clear: probably, it is the Larkin-Imry-Ma state contaminated by the network of the topological defects pinned by the aerogel. The text was submitted by the author in English.     

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.     

Light scattering from spin waves in superfluid3He-A

Summary We show that in theA-phase of superfluid³He one may expect the Mandelstam-Brillouin light scattering from spin waves. The scattering is caused by fluctuations of the magnetic susceptibility.

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Riassunto Si mostra che nella faseA del superfluido³He ci si può aspettare diffusione di luce di Mandelstam-Brillouin da onde di spin. La diffusione è caratterizzata da fluttuazioni della suscettibilità magnetica.

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Резюме Мы покаем, что ьА-qfазе сьерхтекучего³He μожно ожидать рассеяние света Мандельштама-Бриллюэна на спиновых волнах. Рассеяние обусповлено флуктациями магнитной восприимчивости.

     

The effect of electric field on superfluid 3He-A

The effect of an electric field on the l? vector in the A phase of ³He is reexamined. The effect appears roughly by a factor 5 smaller than that predicted by Delrieu previously.