Temperature-dependent multi-k magnetic structure in multiferroic Co3TeO6
2012 (English)In: Materials research bulletin, ISSN 0025-5408, E-ISSN 1873-4227, Vol. 47, no 1, 63-72 p.Article in journal (Refereed) Published
A complex magnetic order of the multiferroic compound Co(3)TeO(6) 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 k(1) = (0, 0.485, 0.055) sets in at 26 K. A transition to a second antiferromagnetic structure with k(2) = (0, 0, 0) takes place at 21.1 K. Moreover, a transition to a commensurate antiferromagnetic structure with k(3) = (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 Co(2+) ions involved in the low-symmetry C2/c structure of Co(3)TeO(6) 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.
Place, publisher, year, edition, pages
2012. Vol. 47, no 1, 63-72 p.
Oxides, Magnetic materials, Crystal structure, Magnetic structure
Condensed Matter Physics Inorganic Chemistry Engineering and Technology
Research subject Chemistry with specialization in Inorganic Chemistry; Engineering Science with specialization in Solid State Physics
IdentifiersURN: urn:nbn:se:uu:diva-168606DOI: 10.1016/j.materresbull.2011.10.003ISI: 000298619400012OAI: oai:DiVA.org:uu-168606DiVA: diva2:500104