title: Europium and manganese magnetic ordering in EuMn2Ge2.
abstract: The antiferromagnetic structures of both the manganese and europium sublattices in EuMn2Ge2 have been determined using thermal neutron diffraction. T(N)(Mn)  =  714(5) K with the 3.35(5) μ(B) (at 285 K) Mn moments ordering according to the I4'/m'm'm space group. The Eu order is incommensurate with the 6.1(2) μ(B) (at 3.6 K) Eu moments oriented parallel to the c-axis with a propagation vector of k  =  [0.153(2) 0 0]. Both neutron diffraction and (151)Eu Mössbauer spectroscopy reveal evidence of magnetic short-range ordering of the Eu sublattice around and above T(N)(Eu)  ∼ 10 K. The ordering temperature of the Eu sublattice is strongly affected by the sample's thermal history and rapid quenching from the melting point may lead to a complete suppression of that ordering.
authors.affiliation: Physics Department and Centre for the Physics of Materials, McGill University, 3600 University Street, Montreal, Quebec, H3A 2T8, Canada.
authors.forename: D H
authors.initials: DH
authors.lastname: Ryan
authors.forename: Rasa
authors.initials: R
authors.lastname: Rejali
authors.forename: J M
authors.initials: JM
authors.lastname: Cadogan
authors.forename: R
authors.initials: R
authors.lastname: Flacau
authors.forename: C D
authors.initials: CD
authors.lastname: Boyer