https://doi.org/10.1140/epjb/s10051-025-00875-9
Regular Article - Statistical and Nonlinear Physics
Influence of two-dimensional discrete breathers on the macroscopic properties of fcc metals
1
Ufa State Petroleum Technological University, Kosmonavtov St. 1, 450062, Ufa, Russia
2
Ufa University of Science and Technology, Zaki Validi St. 32, 450076, Ufa, Russia
3
Bashkir State Medical University, Lenina St. 3, 450008, Ufa, Russia
4
Institute for Metals Superplasticity Problems, Russian Academy of Sciences, Khalturin St. 39, 450001, Ufa, Russia
Received:
11
December
2024
Accepted:
31
January
2025
Published online:
14
February
2025
Delocalized nonlinear vibrational modes (DNVMs) in crystals are precise solutions to the equations governing atomic motion that are determined solely by the symmetry of the lattice. This study investigates the influence of two-dimensional discrete breathers (DBs) excited using four one-component DNVMs on the macroscopic properties of three-dimensional fcc single crystals of Al, Cu, and Ni. All results were obtained using molecular dynamics simulations. Key findings include the observation that the lifetime of two-dimensional DBs is significantly influenced by both the symmetry of the DNVM and the initial oscillation amplitude. The two-dimensional DBs exhibit hard-type nonlinearity, characterized by an increase in oscillation frequency with increasing initial amplitude. The excitation of the DBs leads to a reduction in the crystal's heat capacity, which becomes more pronounced with increasing amplitude. The presence of two-dimensional DBs induces thermal expansion within the crystal, suggesting an impact on the mechanical properties of the material. This research provides new insights into the role of DBs, in influencing the macroscopic properties of fcc metals.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
