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Magnetic properties and crystal structure of solvent-free [email protected] metallofullerene microcrystals.

Authors
  • Ito, Yasuhiro
  • Fujita, Wataru
  • Okazaki, Toshiya
  • Sugai, Toshiki
  • Awaga, Kunio
  • Nishibori, Eiji
  • Takata, Masaki
  • Sakata, Makoto
  • Shinohara, Hisanori
Type
Published Article
Journal
Chemphyschem : a European journal of chemical physics and physical chemistry
Publication Date
May 14, 2007
Volume
8
Issue
7
Pages
1019–1024
Identifiers
PMID: 17427163
Source
Medline
License
Unknown

Abstract

Magnetic properties of solvent-free crystals of the endohedral [email protected] 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 [email protected] 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.

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