Magnetic quantum oscillations in (BEDT-TTF)-based salts have shown a correlation between the cyclotron mass mc and Dingle temperature TD of electrons in the basal planes. "Heavy-electron" systems like k-(BEDT-TTF)2Cu(NCS)2 with mc = (2-5)m0 have a low TD less than 1 K, while "light-electron" systems like κL-(BEDT-TTF)2I3 with mc = (0.3-0.5)m0 have a much higher TD of several to 10 K. Both systems however have the same magnitude of the mean free path (∼ 1000 Å) and of the band width (∼0.5 eV). This is an evidence of many-body renormalizations of mc and τ. An importance of the on-site and/or nearest neighbor Coulomb correlations in heavy-electron organic conductors is discussed.
ASJC Scopus subject areas
- 化学 (全般)