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The AMn5(SO4)6 family of triangular lattice, ferrimagnetic sulfates |
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| Authors: | D.V. West T.M. McQueen X. Ke H.W. Zandbergen P. Schiffer |
| Affiliation: | a Department of Chemistry, Princeton University, Princeton, NJ 08544, USA b Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA c NIST Center for Neutron Research, Gaithersburg, MD 20899, USA d Kavli Institute for Nanoscience, Technical University of Delft, The Netherlands |
| Abstract: | A new family of anhydrous sulfates, A2+Mn5(SO4)6 (A=Pb, Ba, Sr) is reported. The crystal structures of PbMn5(SO4)6 and SrMn5(SO4)6 are solved by powder X-ray and neutron diffraction. BaMn5(SO4)6 is isostructural. PbMn5(SO4)6 crystallizes with  symmetry and unit cell parameters of a=14.551(1) Å and c=7.535(1) Å. The structure has rich features, including dimers of face-sharing MnO6 octahedra, and two complementary triangular layers of Mn atoms. All compounds undergo a magnetic ordering transition at 10 K, below which, the magnetic susceptibility of the compounds varies systematically with the radius of the non-magnetic cation. Low temperature neutron diffraction shows that the complementary triangular layers result in a ferrimagnet with a net moment corresponding to one high spin Mn2+ per unit cell, correlating well with the magnetization data. The non-magnetic variant PbMg5(SO4)6 is also reported. |
| Keywords: | Triangular lattice Geometric frustration Magnetism Sulfate Regular polygon tiling Crystallography New crystal structure |
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