RAMAN-SCATTERING IN FERROMAGNETIC TDAE-C60 COMPARED TO TDAE-C70

The Raman scattering at 1. 16 ev laser excitation has been studied in ferromagnetic TDAE-C60 and compared to that in paramagnetic TDAE-C70. The shift of H(g) and A(g) modes in TDAE-C60 indicates transfer of one electron to C60 while the broadening of H(g) modes is quite similar to metallic K3C60 meaning significant electron-phonon coupling of this Jahn - Teller vibrations. In TDAE-C 70 the lines are narrow sugesting suppresed electron- phonon interaction and hence smaller polaronic effects. Below T(c) of magnetic ordering the two-magnon excitations are not seen clearly however the low energy part of spectra shows somewhat incresed intensity. Upon air-exposure of TDAE-C60 all H(g) and A(g) Raman modes disappear while a new band appears at 1848 cm-1.