Raman scattering study of phonon and spin modes in <script type="math/tex">(TMTSF)_{2}PF_{6}</script>

Popovic, Z.V.; Ivanov, V.A.; Khoung, O.P.; Nakamura, T.; Saito, G.; Moshchalkov, V.V.

doi:10.1016/S0379-6779(01)00385-X

Title

Raman scattering study of phonon and spin modes in $(TMTSF)_{2}PF_{6}$

Author

Popovic, Z.V.

Ivanov, V.A.

Khoung, O.P.

Nakamura, T.

Saito, G.

Moshchalkov, V.V.

Abstract

We have studied polarized Raman spectra of bis-(tetramethyltetraselenafulvalene)hexafluorophosphate ((TMTSF)(2)PF6) single crystals in the wide spectral and temperature range using different laser energies. We observed and assigned 23 Raman active modes. The carbon C=C in-phase and out-of-phase stretching modes at 1464 and 1602 cm(-1) show strong electron molecular vibration (EMV) coupling. The mode at about 1565 cm(-1) is temperature independent below 50 K due to the methyl group motion freezing. For (TMTSF)(2)PF6 in the spin density wave (SDW) phase for a temperature induced dimensionality 1D (quarter-filled dimerized linear chain with correlated electrons) the spin gapless magnon spectra have been calculated. No evidence of spin-lattice coupling or spin-related modes is found in the Raman spectra in the spin density wave (SDW) phase. (C) 2001 Elsevier Science B.V All rights reserved.

Language

English

Source (journal)

Synthetic metals. - Lausanne

Publication

Lausanne : 2001

ISSN

0379-6779

DOI

10.1016/S0379-6779(01)00385-X

Volume/pages

124 :2-3 (2001) , p. 421-429