Synthetic metals: an international journal integrating research and applications on intercalation compounds of graphite, transition metal compounds and quasi one-dimensional conductors vol:124 issue:2-3 pages:421-429
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.