スピネル型バナジウム酸化物の軌道整列 Orbital Ordering in Spinel Vanadate
We studied the orbital ordering of spinel vanadate, MnV<SUB>2</SUB>O<SUB>4</SUB>. It was found that this compound exhibits a structural phase transition from cubic to tetragonal and ferrimagnetic ordering simultaneously at 57 K, and the structural transition temperature can be varied by applied magnetic field, giving rise to a magnetic-field-induced structural phase transition. We obtained the evidence of antiferro-orbital ordering in the tetragonal phase by X-ray diffraction measurement on the single crystal. This simultaneous spin and orbital ordering can be explained by the coupling between spin and orbital degrees of freedom, called Kugel-Khomkii interaction.
日本結晶学会誌 50(2), 124-129, 2008-04-30
The Crystallographic Society of Japan