title: Complex incommensurate helicoidal magnetic ordering of EuNiGe3.
abstract: (151)Eu Mössbauer spectroscopy and neutron powder diffraction are combined to show that the tetragonal (I4mm #107) compound EuNiGe3 orders magnetically below [Formula: see text] K and adopts a complex incommensurate helicoidal magnetic structure at 3.6 K, with a propagation vector [Formula: see text] and a Eu moment of 7.1(2) [Formula: see text]. On warming through 6 K an incommensurate sinusoidal modulation develops and dominates the magnetic order by 12 K.
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: J M
authors.initials: JM
authors.lastname: Cadogan
authors.forename: Rasa
authors.initials: R
authors.lastname: Rejali
authors.forename: C D
authors.initials: CD
authors.lastname: Boyer