Title

Ab initio elasticity and lattice dynamics of AgGaSe2

Document Type

Article

Publication Date

1-13-1997

Abstract

The structural, elastic and vibrational properties of the ternary semiconductor AgGaSe chalcopyrite are studied using the pseudopotential method within the local density approximation. The lattice constants and internal parameter are in good agreement with experiments. The elastic moduli derived from the stresses generated by small strains compare favourably with experiments and the material is elastically anisotropic. All zone-centre phonons are determined by diagonalization of the dynamical matrix derived from the forces generated by small ionic displacements. The calculated phonon frequencies are in excellent agreement with experiment and can be grouped into three bands. Two silent Γ modes are also obtained. The eigenvectors are used to discuss the three-band phonon spectrum and the spectroscopic activity of the modes. 2 2

Publication Source (Journal or Book title)

Journal of Physics Condensed Matter

First Page

375

Last Page

380

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