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

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

1997-11-06

arxiv.org/abs/cond-mat/9711048v1

Tech. Report ISSP, Ser. A, No. 3284 (1997); J. Phys. Soc. Japan 66(12), 4042-4046, (1997).

Physics

Condensed Matter

Strongly Correlated Electrons

7 figures, 8 pages

Scientific paper

10.1143/JPSJ.66.4042

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.

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