Phonon spectrum and vibrational characteristics of linear nanostructures in solid matrices

10th International Conference on Cryocrystals and Quantum Crystals (Final part)

Автор(и)

  • E.V. Manzhelii B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • S.B. Feodosyev B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • I.A. Gospodarev B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • E.S. Syrkin B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • K.A. Minakova National Technical University “Kharkiv Polytechnic Institute”, 21 Frunze Str., Kharkov 61002, Ukraine

DOI:

https://doi.org/10.1063/1.4927047%20

Ключові слова:

graphene nanotubes, quasy-low-dimensional systems, phonon spectra, dynamical stability.

Анотація

The atomic dynamics of linear chains embedded in a crystalline matrix or adsorbed on its surface is studied. A linear chain formed by substitutional impurities in a surface layer and at the same time offsetting from this layer was analyzed particularly. This system models the actively studied experimentally structures in which gas molecules are adsorbed on the walls of the bundles of carbon nanotubes located in certain medium. It is shown that the quasi-one-dimensional features are typical for the chains in which the interatomic interaction is higher than the interaction between the atoms of the chain and the atoms of the crystal matrix. On the local phonon den-sity of atoms of the chain the transition to quasi-one-dimensional behavior has the form of the kink. In other words, it is the first (lowest-frequency) van Hove singularity, which in 3D structures (the system under consideration is generally three-dimensional) corresponds to the transition from closed to open constant-frequency (quasi-plane) surfaces. The local phonon densities of atoms in the chain have one-dimensional character at frequencies higher than the frequency of the van Hove singularity. The rms amplitude of embedded chains atoms vibrations is calculated and the behavior of the atomic vibrations contribution in the low-temperature heat capacity of the system is analyzed.

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Опубліковано

2015-05-18

Як цитувати

(1)
Manzhelii, E.; Feodosyev, S.; Gospodarev, I.; Syrkin, E.; Minakova, K. Phonon Spectrum and Vibrational Characteristics of Linear Nanostructures in Solid Matrices: 10th International Conference on Cryocrystals and Quantum Crystals (Final Part). Fiz. Nizk. Temp. 2015, 41, 718-724.

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