Propagation of zero sound in superfluid {sup 3}He-B under magnetic field

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00754635· OSTI ID:482494

Ashida, Masami; Hara, Jun`ichiro ^[1]; Nagai, Katsuhiko ^[2]

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1. Yamaguchi Univ. (Japan)
2. Hiroshima Univ. (Japan)

The authors present a theory of zero sound propagation in superfluid {sup 3}He-B with an order parameter strongly distorted by magnetic field. A general formula of the dispersion relation for arbitrary magnetic field in the collisionless regime is derived within the weak coupling theory and under the assumption of particle-hole symmetry. The Landau parameters are taken into account up to F{sub 2}{sup 2} and F{sub 0}{sup a}. Numerical results for the sound velocity and absorption spectrum are presented. The authors show that the collective mode J = 1, J{sub z} = 0 yields a sizable peak in the sound absorption spectrum under weak but finite magnetic field. The quasi-particle excitations under magnetic field also exhibit cusp-like fine structures in the absorption spectrum. The authors show that the anomalies discovered by Ling et al. and Saunders et al. near the pair breaking edge in the q {perpendicular} H geometry consist of the J = 1, J{sub z} = 0 collective mode and the pair breaking cusps in the J{sub z} = 0, {plus_minus} 2 channels.

• Sponsoring Organization: USDOE
• OSTI ID: 482494
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 1-2 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HELIUM 3 B
MAGNETIC FIELDS
WAVE PROPAGATION
ZERO SOUND