(Cs X)Cu 5 O 2 (PO 4 ) 2 ( X = Cl, Br, I): A Family of Cu 2+ S = 1 / 2 Compounds with Capped-Kagomé Networks Composed of OCu 4 Units

Three new salt inclusion compounds (Cs X)Cu O (PO ) ( X = Cl, Br, I), phosphate analogues of the kagomé mineral averievite, are reported. Their crystal structures are composed of trigonal networks of corner-sharing OCu anion-centered tetrahedra, forming capped-kagomé planes, which can also be regard...

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Bibliographic Details
Published in:Inorganic chemistry 2019-04, Vol.58 (7), p.4328-4336
Main Authors: Winiarski, Michal J, Tran, Thao T, Chamorro, Juan R, McQueen, Tyrel M
Format: Article
Language:English
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Summary:Three new salt inclusion compounds (Cs X)Cu O (PO ) ( X = Cl, Br, I), phosphate analogues of the kagomé mineral averievite, are reported. Their crystal structures are composed of trigonal networks of corner-sharing OCu anion-centered tetrahedra, forming capped-kagomé planes, which can also be regarded as two-dimensional slices along the [111] direction of a pyrochlore lattice. Magnetization and heat capacity measurements reveal strong geometric frustration of this network and complex magnetic behavior. X-ray and neutron diffraction studies show that all three compounds undergo a trigonal-to-monoclinic phase transition upon cooling, with a first-order phase transition seen in CsBr and CsI analogues. Along with the previously reported (CsCl)Cu O (VO ) , these three new compounds belong to a large family of OCu -based networks, which are a playground for studying frustrated quantum magnetism.
ISSN:0020-1669
1520-510X
DOI:10.1021/acs.inorgchem.8b03464