Magnetic properties and crystal structure of solvent-free Sc@C82 metallofullerene microcrystals.
Magnetic properties of solvent-free crystals of the endohedral Sc@C82 are investigated by SQUID and X-ray powder diffraction. We find that the crystal is a paramagnet and the magnetic susceptibility decreases from 150 K with evidence of antiferromagnetic-like interactions by slow cooling. X-ray crystal analysis reveals the presence of a phase transition at 150 K, which is attributed to an orientational ordering transition of the fullerene molecules. At low temperatures we find a magnetic metastable state that can be controlled by the cooling rate. The metastable state can be formed by rapid cooling. The direction of Sc@C82 molecular axis in the crystals is disordered in the metastable state, and the susceptibility is higher than that in the slow cooling case at low temperature.
Ito
Yasuhiro
Y
Department of Chemistry & Institute for Advanced Research, Nagoya University, Nagoya 464-8602, Japan.
Fujita
Wataru
W
Okazaki
Toshiya
T
Sugai
Toshiki
T
Awaga
Kunio
K
Nishibori
Eiji
E
Takata
Masaki
M
Sakata
Makoto
M
Shinohara
Hisanori
H