Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
63 (1988), S. 3673-3675
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Density fluctuations in heavy-fermion systems are discussed. Particular attention is paid to the hydrodynamic modes and it is pointed out how they differ from those of ordinary metals. A large Landau–Placzek ratio should help to make the quasiparticle diffusion mode observable. The role of the Coulomb interaction is discussed and it is shown that a low-lying optical plasmon should exist. The latter can be overdamped. It compliments the acoustic plasmon (or zero sound) mode into which the quasiparticle diffusion mode goes over for q values outside the hydrodynamic regime. In a recent experiment quasielastic light scattering due to density fluctuations has been observed in UPt3. Furthermore, it is shown that the attenuation mechanism of longitudinal ultrasound in heavy-fermion systems is very different from that of ordinary metals.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.340682
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