Lyddane-Sachs-Teller relationship in linear magnetoelectrics
Materials Science
2011-02-01 v3
Abstract
In a linear magnetoelectric the lattice is coupled to electric and magnetic fields: both affect the longitudinal-transverse splitting of zone-center optical phonons on equal footing. A response matrix relates the macroscopic fields (D,B) to (E,H) at infrared frequencies. It is shown that the response matrices at frequencies 0 and \infty fulfill a generalized Lyddane-Sachs-Teller relationship. The rhs member of such relationship is expressed in terms of weighted averages over the longitudinal and transverse excitations of the medium, and assumes a simple form for an harmonic crystal.
Cite
@article{arxiv.1007.4186,
title = {Lyddane-Sachs-Teller relationship in linear magnetoelectrics},
author = {Raffaele Resta},
journal= {arXiv preprint arXiv:1007.4186},
year = {2011}
}
Comments
4 pages, no figure