title: (3 + 1)-dimensional crystal and antiferromagnetic structures in CeRuSn.
abstract: At 320 K, the crystal structure of CeRuSn is commensurate with the related CeCoAl-type of structure by the doubling of the c lattice parameter. However, with lowering the temperature it becomes incommensurate with x and z position parameters at all three elemental sites being modulated as one moves along the c-axis. The resulting crystal structure can be conveniently described within the superspace formalism in (3 + 1) dimensions. The modulation vector, after initially strong temperature dependence, approaches a value close to qnuc = (0 0 0.35). Below TN = 2.8 (1) K, CeRuSn orders antiferromagnetically with a propagation vector qmag = (0 0 0.175), i.e. with the magnetic unit cell doubled along the c-axis direction with respect to the incommensurate crystal structure. Ce moments appear to be nearly collinear, confined to the a-c plane, forming ferromagnetically coupled pairs. Their magnitudes are modulated between 0.11 and 0.95 μB as one moves along the c-axis.
authors.affiliation: Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, M-AQM, D-14109 Berlin, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Prokeš
authors.forename: V
authors.initials: V
authors.lastname: Petříček
authors.forename: E
authors.initials: E
authors.lastname: Ressouche
authors.forename: S
authors.initials: S
authors.lastname: Hartwig
authors.forename: B
authors.initials: B
authors.lastname: Ouladdiaf
authors.forename: J A
authors.initials: JA
authors.lastname: Mydosh
authors.forename: R-D
authors.initials: RD
authors.lastname: Hoffmann
authors.forename: Y-K
authors.initials: YK
authors.lastname: Huang
authors.forename: R
authors.initials: R
authors.lastname: Pöttgen
mesh_terms: D000497:Alloys / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D003460:Crystallization; D060526:Magnetic Fields; D008422:Materials Testing; D008968:Molecular Conformation; D012428:Ruthenium / Q000737:chemistry*; D014001:Tin / Q000737:chemistry*
chemical_list: D000497:Alloys; D002563:Cerium; D014001:Tin; D012428:Ruthenium