The C=C Stretching Vibrations of k-(BEDT-TTF)_2Cu[N(CN)_2]Br and Its Isotope Analogues

Details The C=C Stretching Vibrations of k-(BEDT-TTF)_2Cu[N(CN)_2]Br and Its Isotope Analogues The C=C Stretching Vibrations of k-(BEDT-TTF)_2Cu[N(CN)_2]Br and Its Isotope Analogues

2001-07-05

arxiv.org/abs/cond-mat/0107101v1

Journal of the Physical Society of Japan, Vol.70 No.12, December, 2001 pp.3728-3738

Physics

Condensed Matter

Superconductivity

8 figures, submitted to the Journal of the Physical Society of Japan

Scientific paper

10.1143/JPSJ.70.3728

The C=C stretching modes in resonance Raman spectra and infrared reflectivity were measured at temperatures between 15 K and 300 K using various polarizations in k-(BEDT-TTF)_2Cu[N(CN)_2]Br, its fully and partially deuterated analogues, and ^{13}C-substituted analogue. The infrared- and Raman-active bands were re-assigned based on the factor group analysis. We found a Raman-active EMV-coupled \nu_3 mode near 1420 cm_{-1}, which shows a large downshift and broadening through the inter-dimer EMV interaction. The mixing of the bridge and ring C=C stretching vibrations depends upon the symmetry of the crystal mode. In contrast to deuterated crystals, the non-deuterated crystals show a splitting in the \nu_2, \nu_3, and \nu_{27} bands.

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