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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 4 Issue 2 (1998) pp 179-184
New aspects of critical sound attenuation in magnetic systems with spin-lattice relaxation
A. Pawlak (a)
Institute of Physics, A. Mickiewicz University, Poznan, Poland
Received: 9 December 1997 / Accepted: 24 February 1998
Abstract: A general theory of critical sound propagation, including phonon-spin-energy coupling, is studied in anisotropic magnets above their transition temperature. The Kawasaki weak singularity in the ultrasonic attenuation is found as a nonasymptotic effect. A new nonasymptotic regime similar to the one in the binary mixture is also determined. The role of coupling constants and the bare relaxation times in establishing the dominance region of particular terms, is discussed.
PACS. 05.70.Jk Critical point phenomena - 62.65.+k Acoustical properties of solids
(a) email: pawlak@phys.amu.edu.pl
Article in PDF-Format (275 KB)
Online publication: August 10, 1998
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