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The evolution of longitudinal and transverse acoustic waves in a medium with paramagnetic impurities

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Abstract

We study the bipartial interaction of longitudinal and transverse acoustic pulses with a system of paramagnetic impurities with an effective spin S=1/2 in a crystalline layer or on a surface in the presence of an arbitrarily directed external constant magnetic field. We derive a new system of evolution equations that describes this interaction and show that, in the absence of losses, for equal phase velocities of these acoustic components, and under the condition of their unidirectional propagation, the original system reduces to a new integrable system of equations. The derived integrable system describes the pulse dynamics outside the scope of the slow-envelope approximation. For one of the reductions of the general model that corresponds to the new integrable model, we give the corresponding equations of the inverse scattering transform method and find soliton solutions. We investigate the dynamics and formation conditions of the phonon avalanche that arises when the initial completely or incompletely inverted state of the spin system decays. We discuss the application of our results to describing the interaction dynamics of spins and acoustic pulses in various systems with an external magnetic field.

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  1. Institute of Automatics and Electrometry, Siberian Division, Russian Academy of Sciences, Universitetskii pr. 1, Novosibirsk, 630090, Russia

    A. A. Zabolotskii

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__________

Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 123, No. 6, 2003, pp. 1239–1255.

Original Russian Text Copyright © 2003 by Zabolotski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\).

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Zabolotskii, A.A. The evolution of longitudinal and transverse acoustic waves in a medium with paramagnetic impurities. J. Exp. Theor. Phys. 96, 1089–1103 (2003). https://doi.org/10.1134/1.1591220

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