The dispersion and attenuation of zero sound in normal Fermi-liquid due to the spin fluctuations

Journal Article · Thu May 01 04:00:00 EDT 1997 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF02397464· OSTI ID:535611

Poltavets, A; Khmelev, I ^[1]

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1. Ural State Univ., Ekaterinburg (Russian Federation)

The scattering of zero-sound phonons by incoherent spin fluctuations (SF) and its influence on the velocity dispersion and attenuation of zero sound in exchange enhanced Fermi-liquid are considered. The contributions of long-wavelength and low-frequency SF to zero-sound velocity and attenuation for the case of {omega}{tau}{much_gt} 1 (where {omega} is a frequency of sound, {tau} is a relaxation time) are calculated. The values of these contributions were compared both with the collision dispersion terms and the terms due to the quantum effects. It is shown that at T {r_arrow} 0 the SF and {open_quotes}quantum{close_quotes} terms in velocity dispersion have the different frequency dependencies and opposite signs and a certain compensation of quantum dispersion effects due to the influence of the SF may appear. The SF contribution may be interpreted in terms of an {open_quotes}effective{close_quotes} renormalization of relaxation time {tau} and can manifest itself in the more appreciable frequency dependence of the temperature of transition from first to zero sound.

• Sponsoring Organization: USDOE
• OSTI ID: 535611
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 107; ISSN 0022-2291; ISSN JLTPAC
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ATTENUATION
DISPERSION RELATIONS
FERMI GAS
FLUCTUATIONS
SPIN
WAVE PROPAGATION
ZERO SOUND