Charged Magnons in NaV2O5
Abstract
We investigated the temperature-dependent optical conductivity of NaV2O5 in the energy range 4 meV-4 eV. By analyzing the optically allowed phonons at various temperatures above and below the phase transition, we conclude that a second-order change to a larger unit cell takes place below 34 K. Moreover, we detected the electronic excitations in the meV and eV energy range. The intensities and the polarization dependence of these excitations give a direct indication for the broken-parity electronic ground-state and, at the same time, for the non-centrosymmetric crystal structure of the system in the high-temperature phase. A direct two-magnon optical absorption process, proposed in this paper, is in quantitative agreement with the optical data.Keywords
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