Abstract
We have studied polarized Raman spectra of bis-(tetramethyltetraselenafulvalene)hexafluorophosphate ((TMTSF)2PF6) single crystals in the wide spectral and temperature range using different laser energies. We observed and assigned 23 Raman active modes. The carbon CC in-phase and out-of-phase stretching modes at 1464 and 1602cm−1 show strong electron molecular vibration (EMV) coupling. The mode at about 1565cm−1 is temperature independent below 50K due to the methyl group motion freezing. For (TMTSF)2PF6 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.
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