Naslov
Crystal stabiliy and optical properties of organic chain compounds

Autori
Županović, Paško ; Bjeliš, Aleksa ; Barišić, Slaven

Izvornik
Europhysics Letters (0295-5075) 45 (1999); 188-194

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
organic compounds; cohesive energy; molecular polarizability;infrared spectra; collective resonances

Sažetak
The solution to the long standing problem of the cohesion of organic chain compounds is proposed. We consider the tight-binding dielectric matrix with two electronic bands per chain, determine the corresponding hybridized collective modes, and show that three among them are considerably softened due to strong dipole-dipole and monopole-dipole interactions. By this we explain the unusual low frequency optical activity of TTF-TCNQ, including the observed 10meV anomaly. The softening of the modes also explains the cohesion of the mixed-stack lattice, the fractional charge transfer almost independent of the material, and the formation of the charged sheets in some compounds.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA