A theoretical lattice dynamics model and phonon dispersion measurements for CaSO4(anhydrite)

AbstractA phenomenological lattice dynamics model has been developed that describes how strain affects phonon frequencies and elastic constants in Group IV and III-V semiconductor thin films and strained layers. Using this model, the phonon dispersion relations for strained-layer heterostructures of Ge and GaAs on Si have been obtained in the quasiharmonic approximation. This model uses available experimental data and can predict the effect of arbitrary strains on thin films.

Download Full-text

A lattice-dynamics model of the interaction of a dislocation with point defects

Journal de Physique ◽

10.1051/jphys:019840045080133700 ◽

1984 ◽

Vol 45 (8) ◽

pp. 1337-1345 ◽

Cited By ~ 11

Author(s):

J.A. Caro ◽

N. Glass

Keyword(s):

Point Defects ◽

Lattice Dynamics ◽

Dynamics Model

Download Full-text

Spin-lattice dynamics model with angular momentum transfer for canonical and microcanonical ensembles

Physical Review B ◽

10.1103/physrevb.103.024429 ◽

2021 ◽

Vol 103 (2) ◽

Author(s):

Mara Strungaru ◽

Matthew O. A. Ellis ◽

Sergiu Ruta ◽

Oksana Chubykalo-Fesenko ◽

Richard F. L. Evans ◽

...

Keyword(s):

Angular Momentum ◽

Momentum Transfer ◽

Lattice Dynamics ◽

Dynamics Model ◽

Angular Momentum Transfer ◽

Spin Lattice

Download Full-text

Electron Correlation Effects on the Lattice Dynamics of Sodium and Potassium

Canadian Journal of Physics ◽

10.1139/p75-193 ◽

1975 ◽

Vol 53 (16) ◽

pp. 1507-1512 ◽

Cited By ~ 6

Author(s):

V. K. Jindal

Keyword(s):

Dielectric Function ◽

Lattice Dynamics ◽

Phonon Dispersion ◽

Matrix Elements ◽

Correlation Effects ◽

Phonon Dispersion Curves ◽

Electron Correlation Effects ◽

Experimental Values ◽

The One ◽

Sodium And Potassium

The phonon dispersion curves for sodium and potassium have been calculated using the one OPW (orthogonalized plane wave) bare electron matrix elements and the dielectric function of Vashishta and Singwi. Results are compared with experimental results as well as with similar calculations using the dielectric function of Geldart and Taylor. It is found that the screening function of Vashishta and Singwi gives at least as good an agreement with experimental values as obtained from the screening function of Geldart and Taylor. The interionic potentials for these metals have also been calculated and compared with similar calculations done previously. The reason for the appreciable difference between the potentials is discussed.

Download Full-text

Article

Canadian Journal of Physics ◽

10.1139/p97-044 ◽

1998 ◽

Vol 76 (2) ◽

pp. 143-151

Author(s):

J S Ononiwu

Keyword(s):

Lattice Dynamics ◽

Alkaline Earth ◽

Phonon Dispersion ◽

Earth Metal ◽

Model Potential ◽

Dispersion Curves ◽

The Body ◽

Symmetry Direction ◽

Normal Ordering ◽

Phonon Dispersion Curves

A phenomenological one-parameter model potential that includes sp-d hybridization and core--core exchange contributions is used to calculate the phonon dispersion curves in the lattice dynamics of the body-centered cubic alkaline-earth metal, barium. There is good overall agreement between theory and experiment, and in particular, in the [xi00] direction we obtained frequencies of the transverse dispersion curves that are lower than those of the longitudinal dispersion curves along the [100] symmetry direction thereby restoring the normal ordering of the branches.PACS Nos.: 63.20D

Download Full-text