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Title: Simulation of the interaction between discrete breathers of various types in a Pt{sub 3}Al crystal nanofiber

It is known that, in a molecular dynamics model of Pt{sub 3}Al 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 Pt{sub 3}Al 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 Almore » 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.« less
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1]
  1. Shukshin Altai State Academy of Education (Russian Federation)
  2. Polzunov Altai State Technical University (Russian Federation)
  3. Russian Academy of Sciences, Institute of Metals Superplasticity Problems (Russian Federation)
Publication Date:
OSTI Identifier:
22472135
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 121; Journal Issue: 2; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM ALLOYS; ATOMS; CRYSTALS; ELECTRONS; ENERGY TRANSFER; MOLECULAR DYNAMICS METHOD; NONLINEAR PROBLEMS; PHASE TRANSFORMATIONS; PHONONS; PLATINUM BASE ALLOYS; SURFACES; VISIBLE RADIATION