Journal
SYNTHETIC METALS
Volume 135, Issue 1-3, Pages 587-588Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0379-6779(02)00772-5
Keywords
Raman spectroscopy; metal-insulator phase transition; organic conductors based on radical cation salts
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Raman studies of alpha-(BEDT-TTF)(2)I-3 [BEDT-TTF is bis-ethylenedithiolo(tetrathiafulvalene)] have been performed to investigate the charge distribution between BEDT-TTFs below and above the metal-insulator phase transition at T-M.(I)=135 K. Following the crystal-symmetry lowering at T-M.(I), clear +/-0.3e deviation from average 0.5e charge has been found in the nonmagnetic insulating phase. In the paramagnetic semi-metal-like phase, the split of one of the Raman active mode suggests charge nonequivalence between donors.
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