Issue |
Europhys. Lett.
Volume 41, Number 2, January II 1998
|
|
---|---|---|
Page(s) | 177 - 182 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1998-00127-x | |
Published online | 01 September 2002 |
Critical sound propagation in mixtures
1
Institute for Theoretical Physics, University of Linz, Austria
2
Institute for Physics and Biophysics, University of Salzburg, Austria
Received:
12
September
1997
Accepted:
24
November
1997
We calculate critical effects in the sound propagation in mixtures
near consolute or plait points within a non-asymptotic renormalization
group theory and derive general expressions for the frequency-dependent
sound velocity and sound attenuation. The critical non-asymptotic
time scale in the sound mode in mixtures is set by an effective order
parameter Onsager coefficient containing a dynamical parameter related
to the enhancement of the thermal conductivity in the mixture, not
considered so far.
The differences in the critical behavior near the consolute and plait
point are due to the different non-asymptotic behavior of the
zero-frequency sound velocity. We compare our predictions for the sound
velocity and sound absorption near the plait point in -
mixtures.
PACS: 64.60.Ht – Dynamic critical phenomena / 64.70.Fx – Liquid-vapor transitions / 64.70.Ja – Liquid-liquid transitions
© EDP Sciences, 1998
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