Influence of strong anharmonicity on the dynamical properties of a crystal with BCC Lattice

The correlative method of unsymmetrized self-consistent field (CUSF) is used to study dynamical characteristics of a strongly anharmonic crystal with body-centered cubic lattice, namely, the inter-atomic and mean square relative displacements. We present the general formulae for crystals with anharmonicity, including the strong one, up to fourth anharmonic terms. Taking into account the second order of the method we calculate correlations in this lattice between the nearest, second, third, fourth and fifth neighbors. The influence of more distant interactions is discussed. The results are compared with those obtained previously for an weakly anharmonic BCC crystal. We use the Schiff potencial for Na and also Lennard-Jones potentials for comparison.

Authors
Rodrigues C.G.1 , Pascual M.F.1 , Zubov V.I. 1, 2
Editors
-
Publisher
Sociedade Brasileira de Fisica
Number of issue
3
Language
English
Pages
450-456
Status
Published
Department
-
Number
-
Volume
29
Year
1999
Organizations
  • 1 Instituto de Física, Universidade Federal de Goiás, C.P. 131, 74001-970 Goiânia-GO, Brazil
  • 2 Department of Theoretical Physics, People's Friendship University, Moscow, Russian Federation
Keywords
-
Date of creation
19.10.2018
Date of change
19.10.2018
Short link
https://repository.rudn.ru/en/records/article/record/598/