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New aspects of critical sound attenuation in magnetic systems with spin-lattice relaxation

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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.

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Authors and Affiliations

  1. Institute of Physics, A. Mickiewicz University, Poznan, Poland

    A. Pawlak

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  1. A. Pawlak
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Received: 9 December 1997 / Accepted: 24 February 1998

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Pawlak, A. New aspects of critical sound attenuation in magnetic systems with spin-lattice relaxation. Eur. Phys. J. B 4, 179–184 (1998). https://doi.org/10.1007/s100510050367

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  • DOI: https://doi.org/10.1007/s100510050367

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