Abstract
Neutron magnetic diffraction and AC magnetic susceptibility measurements reveal the existence of both the ferromagnetic and noncollinear antiferromagnetic components for the Mn moments in a fully oxygenated LuMnO 3 . The observed magnetic intensities are consistent with a magnetic structure that can be described by using the Kovalev Γ 5 irreducible representation, where the Mn moments lie in the basal MnO 2 planes and the couplings between the adjacent MnO 2 planes are ferromagnetic, with a saturated moment of 〈μ z 〉 = 3.22(1) μ B . © 2004 Elsevier B.V. All rights reserved.