| Abstract: | The interaction of transverse picosecond deformation pulses with a system of S=1/2 spins, forming a paramagnetic crystal, is investigated theoretically. The influence of acoustic dispersion, owing to the lattice structure, and the anharmonicity of atomic vibrations on the formation of stationary soliton-like video pulses, interacting with the spins of paramagnetic atoms, is studied for the example of a cubic crystal. The phenomenon of total reflection of deformation pulses from the paramagnetic crystal is predicted. The amplification and self-compression of nonresonant pulses in nonequilibrium paramagnetics is studied, and it is shown that generation of higher-order (up to tenth-order) harmonics of the frequency of the initial signal is possible. It is concluded that for appropriate crystal parameters, a  limiting solition with a duration of one period of the oscillations, corresponding to spatial size of the order of the lattice constant of the crystal, is possible at the final stage of amplification.V. V. Kuibyshev Tomsk State University, Tomsk. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 94–113, July, 1993. |
