Abstract
We report on the magnetic structure of CdMn7O12 determined by powder neutron diffraction. We were able to measure the magnetic structure of this Cd containing and highly neutron absorbing material by optimizing the sample geometry and by blending the CdMn7O12 with Aluminum powder. Below its Néel temperature TN1 all magnetic reflections can be indexed by a single commensurate propagation vector k = (0, 0, 1). This is different to the case of CaMn7O12 where the propagation vector is incommensurate and where an in-plane helical magnetic structure has been found. We observe a commensurate non-collinear magnetic structure in CdMn7O12 with in-plane aligned magnetic moments resembling the ones in CaMn7O12. However, the commensurate propagation vector prevents the appearance of a helical magnetic structure in CdMn7O12. Finally, we also observe a third structural phase transition below ~60 K that can be attributed to phase separation.
Highlights
Multiferroic CaMn7O128,14 belongs to the quadruple perovskite family with general formula (AA3′)B4O12
Except for CaMn7O12, the other quadruple perovskite manganites have to be synthesized under high pressure and high temperature conditions rendering the sample availability more difficult
CdMn7O12 exhibits a structural transition at Ts1 ~ 493 K and two successive magnetic transitions at TN1 = 88 K and TN2 = 33 K
Summary
Multiferroic CaMn7O128,14 belongs to the quadruple perovskite family with general formula (AA3′)B4O12. The crystal structure of CdMn7O12 at room temperature is trigonal (space group R3). We report the magnetic structure of CdMn7O12 determined by powder neutron diffraction (PND).
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