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The molecular dynamics method is used to consider the effect of energy transport in an A3B stoichiometry crystal, using Pt3Al as an example, which consists in the transfer of energy at frequencies outside the phonon spectrum of the crystal. This effect is called the effect of nonlinear supratransmission. The model was a bulk face-centered cubic crystal, the atoms of which interacted through a multi-particle potential, obtained by the immersed atom method. Different forms of oscillation of the region of external influence are considered. The possibility of transporting energy from the crystal surface into the depths by means of excitation of quasi-breathers near the impact area and their subsequent destruction in a crystal and dissipation of energy, stored on them, is shown. The quasi-breathers most intensely occurred near the impact region with a sinusoidal waveform. The results obtained indicate that the contribution of quasi-breathers to the energy transfer through the crystal, increases with increasing exposure amplitude. The minimum amplitude of the external influence, at which this effect was observed, is established. The results of the study can be useful in creating materials with predetermined properties, through various intensive external influences.

Energy transport in an A3B crystal with intense external exposure at frequencies outside the crystal spectrum

Energy transport in an A₃B crystal with intense external exposure at frequencies outside the crystal spectrum