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Simulation of the interaction between discrete breathers of various types in a Pt3Al crystal nanofiber

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Abstract

It is known that, in a molecular dynamics model of Pt3Al crystal, a discrete breather (DB) with soft type nonlinearity (DB1) can be excited, which is characterized by a high degree of localization on a light atom (Al), stationarity, as well as a frequency that lies in the gap of the phonon spectrum and decreases with increasing amplitude of the DB. In this paper, it is demonstrated that a DB with hard type nonlinearity (DB2) can be excited in a Pt3Al nanofiber; this DB is localized on several light atoms, can move along the crystal, and has a frequency that lies above the phonon spectrum and increases with the DB amplitude. It is noteworthy that the presence of free surfaces of a nanofiber does not prevent the existence of DB1 and DB2 in it. Collisions of two DBs counterpropagating with equal velocities, as well as a collision of DB2 with a standing DB1, are considered. Two colliding DBs with hard type nonlinearity are repelled almost elastically, losing only insignificant part of their energy during the interaction. DB2 is also reflected from a standing DB1; in this case, the energy of the breathers is partially scattered into the Al sublattice. The results obtained indicate that DBs can transfer energy along a crystal over large distances. During the collision of two or more DBs, the energy localized in space can be as high as a few electron-volts; this allows one to raise the question of the participation of DBs in structural transformations of the crystal.

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Authors and Affiliations

  1. Shukshin Altai State Academy of Education, ul. Korolenko 53, Biisk, Altai krai, 659333, Russia

    P. V. Zakharov & A. M. Eremin

  2. Polzunov Altai State Technical University, Biisk, Altai krai, 656038, Russia

    P. V. Zakharov, M. D. Starostenkov & N. N. Medvedev

  3. Institute of Metals Superplasticity Problems, Russian Academy of Sciences, ul. Khalturina 39, Ufa, Bashkortostan, 450001, Russia

    S. V. Dmitriev

  4. National Research Tomsk State University, Tomsk, 634050, Russia

    S. V. Dmitriev

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  1. P. V. Zakharov
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  2. M. D. Starostenkov
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  3. S. V. Dmitriev
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  4. N. N. Medvedev
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  5. A. M. Eremin
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Correspondence to P. V. Zakharov.

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Original Russian Text © P.V. Zakharov, M.D. Starostenkov, S.V. Dmitriev, N.N. Medvedev, A.M. Eremin, 2015, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2015, Vol. 148, No. 2, pp. 252–257.

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Zakharov, P.V., Starostenkov, M.D., Dmitriev, S.V. et al. Simulation of the interaction between discrete breathers of various types in a Pt3Al crystal nanofiber. J. Exp. Theor. Phys. 121, 217–221 (2015). https://doi.org/10.1134/S1063776115080154

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  • DOI: https://doi.org/10.1134/S1063776115080154

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