title: Orbital ordering and magnetic field effect in MnV2O4.
abstract: We studied the structural properties of an orbital-spin-coupled spinel oxide, MnV2O4, mainly by single-crystal x-ray diffraction measurement. It was found that a structural phase transition from cubic to tetragonal and ferrimagnetic ordering occur at the same temperature (Ts,TN=57 K). The structural phase transition was induced also by magnetic field above Ts. In addition, magnetic-field-induced alignment of tetragonal domains results in large magnetostriction below Ts. We also found that the structural phase transition is caused by the antiferro-type ordering of the V t2g orbitals.
authors.affiliation: Department of Physics, Waseda University, Tokyo 169-8555, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Katsumura
authors.forename: K
authors.initials: K
authors.lastname: Taniguchi
authors.forename: T
authors.initials: T
authors.lastname: Arima
authors.forename: T
authors.initials: T
authors.lastname: Katsufuji