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A complex magnetic order of the multiferroic compound Co3TeO6 has beenrevealed by neutron powder diffraction studies on ceramics and crushed singlecrystals. The compound adopts a monoclinic structure (s.g. C2/c) in the studiedtemperature range 2 K - 300 K but exhibits successive antiferromagnetictransitions at low temperature. Incommensurate antiferromagnetic order with thepropagation vector k1 = (0, 0.485, 0.055) sets in at 26 K. A transition to asecond 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 determinedby neutron powder diffraction using group theory analysis as a preliminarytool. Different coordinations of the Co2+ ions involved in the low-symmetryC2/c structure of Co3TeO6 render the exchange-interaction network very complexby itself. The observed magnetic phase transformations are interpreted as anevidence of competing magnetic interactions. The temperature dependent changesin the magnetic structure, derived from refinements of high-resolution neutrondata, are discussed and possible mechanisms connected with the spinreorientations are described.

Temperature-dependent multi-k magnetic structure in multiferroic Co3TeO6