Raman, infrared and optical spectra of the spin-Peierls compound NaV_2O_5

Abstract

We have measured polarized spectra of Raman scattering, infrared and optical transmission of NaV_2O_5 single crystals above the temperature of the spin-Peierls transition Tsp=35 K. Some of the far-infrared (FIR) phonon lines are strongly asymmetric, due to the spin-phonon interaction. In addition to the phonon lines, a broad band was observed in the c(aa)c Raman spectrum and in the E||a FIR transmission spectrum. A possible origin of these bands is discussed. The absorption band at 10000 cm-1 1.25 eV is attributed to vanadium d-d electronic transitions while the absorption edge above 3 eV is supposed to correspond to the onset of charge-transfer transitions.

7 figures, 8 pages

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• Spin gap behavior and charge ordering in α^{\prime}-NaV_2O_5 probed by light scattering
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• Optical spectroscopic study of the interplay of spin and charge in NaV2O5
• Low temperature ellipsometry of NaV2O5
• Theoretical study of the optical conductivity of ${\alpha }^{\prime }-Na{V}_2{O}_5$
• Raman Scattering in the Inorganic Spin-Peierls System alpha'-Na_{1-delta}V_2O_5
• Temperature dependence of optical spectral weights in quarter-filled ladder systems
• Optical properties and electronic structure of Ca-doped alpha'-NaV2O5
• Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states?
• Lattice vibrations of alpha'-NaV2O5
• Optical Conductivity of the Trellis-Lattice t-J Model: Charge Fluctuations in NaV_2O_5
• Infrared and Raman spectra of LiV2O5 single crystals
• Pressure-induced changes in the optical properties of quasi-one-dimensional $\beta$-Na${}_{0.33}$V${}_2$O${}_5$
• One-dimensional dynamics of the d-electrons in ${\alpha }^{\prime }$-NaV${}_2$O${}_5$
• Optical properties, electron-phonon coupling, and Raman scattering of vanadium ladder compounds
• A Model Study of the Low-Energy Charge Dynamics of NaV_2O_5
• Unconventional anisotropic superexchange in NaV2O5
• Low-energy excitations in NaV2O5
• Optical properties of NaxV2O5
• Charge-ordering and optical transitions of LiV2O5 and NaV2O5
• Using electronic structure changes to map the H-T phase diagram of alpha'-NaV2O5
• Raman Scattering cross section of Spin Ladders
• Electronic Properties of α'-NaV_2O_5