Naslov
Magnetic properties of powder and crystalline TDAE-C60

Autori
Tokumoto, M. ; Song, Y.S. ; Tanaka, K. ; Sato, T. ; Yamabe, T. ; Omerzu, Aleš ; Pokhodnia, K. ; Mihailović, Dragan

Izvornik
Synthetic metals (0379-6779) 86 (1997), 1-3; 2315-2316

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

Ključne riječi
magnetic measurements ; magnetic phase transitions ; fullerenes and derivatives

Sažetak
Magnetic properties of a molecular soft ferromagnet TDAE-C-60 (TDAE ; tetrakis(dimethylamino) ethylene) are studied by SQUID magnetometer both in powder and crystalline forms. In powder samples, a clear hysteresis between zero-field cooled (ZFC) and field cooled (FC) magnetizations was observed below about 10 K, consistent with our previous observation of a cusp in the temperature dependence of nonlinear ac susceptibility. In addition, an extremely slow relaxation phenomena of magnetization and the stretched exponential type time-dependence was observed at low temperatures. These characteristics are reminiscent of a ''spin-glass'' with the freezing temperature T-f at about 10 K, although the temperature dependence of magnetic moment at higher temperature above 10 K behaves like a ferromagnet with a transition temperatureT(C) similar to 16 K. On the other hand, an extremely sharp phase transition at similar to 16 K accompanied by a stepwise structure at about 10 K was observed in crystalline samples.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Interdisciplinarne prirodne znanosti

POVEZANOST RADA