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Winiarski MJ, Tran TT, Chamorro JR, McQueen TM. (Cs X)Cu 5O 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. Inorg Chem 2019; 58:4328-4336. [PMID: 30855961 DOI: 10.1021/acs.inorgchem.8b03464] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Three new salt inclusion compounds (Cs X)Cu5O2(PO4)2 ( X = Cl, Br, I), phosphate analogues of the kagomé mineral averievite, are reported. Their crystal structures are composed of trigonal networks of corner-sharing OCu4 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)Cu5O2(VO4)2, these three new compounds belong to a large family of OCu4-based networks, which are a playground for studying frustrated quantum magnetism.
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Affiliation(s)
- Michal J Winiarski
- Department of Chemistry, Department of Physics and Astronomy, and Institute for Quantum Matter , Johns Hopkins University , Baltimore , Maryland 21218 , United States.,Faculty of Applied Physics and Mathematics , Gdansk University of Technology , ul. Narutowicza 11/12 , 80-233 Gdansk , Poland
| | - Thao T Tran
- Department of Chemistry, Department of Physics and Astronomy, and Institute for Quantum Matter , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | - Juan R Chamorro
- Department of Chemistry, Department of Physics and Astronomy, and Institute for Quantum Matter , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | - Tyrel M McQueen
- Department of Chemistry, Department of Physics and Astronomy, and Institute for Quantum Matter , Johns Hopkins University , Baltimore , Maryland 21218 , United States.,Department of Materials Science and Engineering , Johns Hopkins University , Baltimore , Maryland 21218 , United States
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