Optical Properties and Raman Scattering of Vanadium Ladder Compounds

Abstract

We investigate electronic and optical properties of the V-based ladder compounds NaV2O5, the iso-structural CaV2O5 as well as MgV2O5, which differs from NaV2O5 and CaV2O5 in the c axis stacking. We calculate ab initio the Ag phonon modes in these compounds as a basis for the investigation of the electron-phonon and spin-phonon coupling. The phonon modes together with the dielectric tensors as a function of the corresponding ion displacements are the starting point for the calculation of the Ag Raman scattering.