High-field ground-state level crossing and magnetic susceptibility of an {Fe-8}-cubane cluster

作者：Matsuo Akira^*; Kindo Koichi; Nojiri Hiroyuki; Engelhardt Larry; Luban Marshall; Brechin Euan K; Gass Ian A

来源：Physical Review B, 2009, 80(9): 092401.

DOI：10.1103/PhysRevB.80.092401

• energy level crossing
• ferromagnetic materials
• ground states
• Heisenberg model
• iron compounds
• magnetic susceptibility
• nanostructured materials
• organic compounds

The differential susceptibility, dM/dH, of an {Fe-8}-cubane cluster has been measured for magnetic fields up to 54 T at 1.3 and 4.2 K using a pulsed-field technique. The data feature a single strong peak at 42 /- 1 T, corresponding to a ground state level crossing at that field, in excellent agreement with the predicted value, 41 /- 1 T, obtained using a Heisenberg model of the cluster. The theoretical model also accurately accounts for detailed features of the temperature and field dependence of the width and height of the observed peak.

• 出版日期2009-9