Temperature-dependent multi-k magnetic structure in multiferroic Co3TeO6 |
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| Authors: | SA Ivanov R Tellgren C Ritter P Nordblad R Mathieu G André NV Golubko ED Politova M Weil |
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| Affiliation: | 1. Department of Inorganic Materials, Karpov’ Institute of Physical Chemistry, Vorontsovo pole, 10, 105064, Moscow K-64, Russia;2. Department of Engineering Sciences, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden;3. Department of Materials Chemistry, Uppsala University, Box 538, SE-751 21 Uppsala, Sweden;4. Institute Laue Langevin, Grenoble, France;5. Laboratoire Leon Brillouin, CEA, Saclay, France;6. Institute for Chemical Technologies and Analytics, Vienna University of Technology, A-1060 Vienna, Austria;1. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany;2. Department of Physics & Astronomy, University of British Columbia, 6224 Agricultural Rd., Vancouver, BC, Canada V6T 1Z4;3. Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany;1. Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland;2. Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156 - 38042 Grenoble Cedex 9, France;3. ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom;1. Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia;2. Department of Physics, Lomonosov Moscow State University, 119991, Moscow, Russia;3. Experimental Physics V, University of Augsburg, 86159, Augsburg, Germany;1. Institut für Physik der Kondensierten Materie, TU Braunschweig, 38106 Braunschweig, Germany;2. Leibniz-Institut für Festkörper, und Werkstoffforschung IFW Dresden, 01069 Dresden, Germany;3. Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany;4. Australian Centre for Neutron Scattering, ANSTO, Kirrawee DC, New South Wales 2234, Australia;1. Institute of Physics, Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic;2. CCTN, IST/CFMCUL, University of Lisbon, Nuclear and Technological Campus, P-2695-066 Bobadela, Portugal;3. Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany;4. Charles University in Prague, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Prague, Czech Republic;1. Department of Chemistry - Ångström Laboratory, Uppsala University, Box 538, 751 21 Uppsala, Sweden;2. Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden;3. Institut Laue-Langevin, B.P. 156, 38042 Grenoble Cedex 9, France;4. MAX IV Laboratory, Lund University, Box 118, 221 00 Lund, Sweden;5. Nuclear Physics Institute, Academy of Sciences of the Czech Republic, 25068 Rez, Czech Republic |
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| Abstract: | A complex magnetic order of the multiferroic compound Co3TeO6 has been revealed by neutron powder diffraction studies on ceramics and crushed single crystals. The compound adopts a monoclinic structure (s.g. C2/c) in the studied temperature range 2–300 K but exhibits successive antiferromagnetic transitions at low temperature. Incommensurate antiferromagnetic order with the propagation vector k1 = (0, 0.485, 0.055) sets in at 26 K. A transition to a second antiferromagnetic structure with k2 = (0, 0, 0) takes place at 21.1 K. Moreover, a transition to a commensurate antiferromagnetic structure with k3 = (0, 0.5, 0.25) occurs at 17.4 K. The magnetic structures have been determined by neutron powder diffraction using group theory analysis as a preliminary tool. Different coordinations of the Co2+ ions involved in the low-symmetry C2/c structure of Co3TeO6 render the exchange-interaction network very complex by itself. The observed magnetic phase transformations are interpreted as an evidence of competing magnetic interactions. The temperature dependent changes in the magnetic structure, derived from refinements of high-resolution neutron data, are discussed and possible mechanisms connected with the spin reorientations are described. |
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