Naslov
Electrical conductivity in dynamically orientationally disordered systems: ac and dc measurements in ferromagnetic single crystals of TDAE-C-60

Autori
Omerzu, Aleš ; Mihailovič, Dragan ; Tomić, Silvia ; Milat, Ognjen ; Biškup, Nevenko

Izvornik
Physical review letters (0031-9007) 77 (1996), 10; 2045-2048

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

Ključne riječi
fullerene ; RbC60

Sažetak
In spite of a metallic C/sub 60/ molecular ground state, electrical conductivity measurements performed on single crystals of ferromagnetic TDAE-C/sub 60/ fail to show evidence of metallic behavior. Instead, the material appears to be an insultor exhibiting conductivity of the form sigma ( omega , T)= sigma /sub DC/(T)+ sigma /sub AC/( omega ). Phonon-assisted activated polaronic hopping and interbuckyball tunneling, respectively, are proposed as the mechanisms for the two processes. The transition from a dynamically disordered state (rotating buckyballs) to a quasiordered state (frozen buckyballs) is clearly visible as a change in activation energy in the conductivity at T/sub 0/=150 K.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA