Isotope effects in the raman spectra of BEDT-TTF and ß-(BEDT-TTF)2I3

G. Leising, S. Lefrant, J. P. Buisson, W. Kang, C. Lenoir, P. Batail, D. Jerome

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We have performed a Raman spectroscopic investigation on 13C enriched BEDT-TTF molecules which has been motivated by isotope shift experiments of the superconducting transition in the ßH phase of (BEDT-TTF)2I3 (Tc ≈ 8.2K at mid transition) stabilized at low temperature via the adequate cooling procedure. In the C=C stretching region, two main bands are observed at 1521 and 1468 cm-1, shifted downward compared to the 1555 and 1495 cm-1 in 12C BEDT-TTF, and simple calculations predict very well this shift. Also, these bands are recorded with different intensities. In the Raman spectrum, the 1512 cm-1 mode, assigned to a combination mode, presumbly appears much weaker at 1485 cm-1.

Original languageEnglish
Pages (from-to)2137-2140
Number of pages4
JournalSynthetic Metals
Issue number1-2
StatePublished - 15 May 1991


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