title: Magnetic and orbital ordering in the spinel MnV2O4.
abstract: Neutron inelastic scattering and diffraction techniques have been used to study the MnV2O4 spinel system. Our measurements show the existence of two transitions to long-range ordered ferrimagnetic states, the first collinear and the second noncollinear. The lower temperature transition, characterized by development of antiferromagnetic components in the basal plane, is accompanied by a tetragonal distortion and the appearance of a gap in the magnetic excitation spectrum. The low-temperature noncollinear magnetic structure has been definitively resolved. Taken together, the crystal and magnetic structures indicate a staggered ordering of the V d orbitals. The anisotropy gap is a consequence of unquenched V orbital angular momentum.
authors: Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. garleao@ornl.gov
authors: V O
authors: VO
authors: Garlea
authors: R
authors: R
authors: Jin
authors: D
authors: D
authors: Mandrus
authors: B
authors: B
authors: Roessli
authors: Q
authors: Q
authors: Huang
authors: M
authors: M
authors: Miller
authors: A J
authors: AJ
authors: Schultz
authors: S E
authors: SE
authors: Nagler