SCHOBER, H and STRAUCH, D (1993) INVESTIGATION OF THE LO TO SPLITTING IN COMPLEX BINARY CRYSTALS. JOURNAL OF PHYSICS-CONDENSED MATTER, 5 (34). pp. 6165-6182. ISSN 0953-8984,
Full text not available from this repository.Abstract
The trace of the irregular part of the dynamical matrix for q = 0 constitutes a measure OMEGA2 of the LO-TO splitting. Assuming that the lattice dynamics of the crystals under investigation can be described by shell models, analytical expressions for OMEGA as well as the high-frequency dielectric constants am derived for the large class of binary crystals with only one polarizable ion type. The general theory is applied to the concrete cases of alpha-quartz (SiO2) and sapphire (Al2O3). Using the analytical expressions, it is shown how the LO-TO splitting imposes strong correlations on the model parameters. Particular attention is given to the scaling of the ionic charge and high-frequency dielectric constant with the polarizability. This scaling behaviour is detected, when comparing different shell models, used to describe the lattice dynamics of alpha-quartz and sapphire.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LATTICE-DYNAMICS; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/53824 |
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