RESONANCE RAMAN INVESTIGATIONS OF THE ELECTRON PHONON COUPLING IN THE ORGANIC SUPERCONDUCTORS BETA-(BEDT-TTF)(2)IAUI AND KAPPA-(BEDT-TTF)(2)I-3

摘要

We investigated the resonance Raman scattering of the low energetic modes of the organic superconductors beta-(BEDT-TTF)(2)IAuI (T-c = 4 K) and kappa-(BEDT-TTF)(2)I-3 (T-c = 4 K). In the kappa-phase of (BEDT-TTF)(2)I-3 6 low energetic phonons below 100 cm(-1) exist. No distinct change in the phonon structure occurs on going from the normal to the superconducting state. In the beta-phase of (BEDT-TTF)(2)IAuI only two phonon modes at 27 cm(-1) and 33 cm(-1) are observed. On cooling from the normal to the superconducting state the intensity of these modes drops by a factor of about 5. Similar effects were already observed in other beta-phases of organic superconductors. [References: 9]