Abstract Raman scattering of several organic charge-transfer salts containing BEDT-TTF of ET cation such as $\kappa$-ET2Cu(NCS)2, $\beta$L-ET2I3, $\alpha$-ET3Cl2. 2H2O, $\alpha$-ET3 (ReO4)2 and ETFeBr4 were measured and the variations of the frequencies of C=C bonds of ET molecules on charge transfer were observed. It is found that the energy of C=C stretch modes shows a general downward shift upon ionisation of ET molecule. In addition, we have observed the Raman spectra of C=C stretch vibratinns in $\kappa$-ET2Cu(NCS)2 single crystal on going through Tc(～10.4 K) and found no detectable effect during the superconducting phase transition.
Received: 11 March 1995
Accepted manuscript online:
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