Use of Morphic Effects for the Study of Vibrational and Optical Properties of Impurity Atoms in Crystals

Maradudin, A. A.; Ganesan, S.; Burstein, E.

doi:10.1103/physrev.163.882

Cited by 25 publications

(1 citation statement)

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“…In their pioneering work, Maradudin et al 15 have shown how strain-related morphic effects can be explicitly expressed in terms of microscopic parameters of the crystal (i.e., including force constants and dipole-moment coefficients). In that study, a theoretical characterization of morphic effects enabled those researchers to locate four independent deformation potential parameters and the morphic effect itself was proposed as a means for determining intrinsic physical properties and crystal parameters.…”

Section: Introductionmentioning

confidence: 99%

First-Order Transverse Phonon Deformation Potentials of Tetragonal Perovskites

Deluca

Pezzotti

2008

J. Phys. Chem. A

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A theoretical formalism is put forward with the aim of describing the softening of first-order transverse optical phonons in a strained tetragonal perovskitic lattice. On the basis of the dynamical equation for nondegenerate polar modes, the influence of oblique phonons could be first described by assuming a prevalence of short-range interatomic forces; then, the softening effect arising from external stress could be explicitly expressed as a function of orientation of the crystallographic texture. As a further step in the adopted formalism, the microstructure of a perovskitic polycrystal has been ideally modeled as an ensemble of mesocrystals, whose individual crystallographic directions corresponded to an average orientation over the unit volume of the probe. An experimental confirmation of the theoretical formalism is concurrently carried out, and phonon deformation potentials (PDP) have been directly measured for the first-order transverse phonon of a tetragonal PbZrTiO3 perovskite lattice.

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Section: Introductionmentioning

confidence: 99%