Uncovering the S = ½ kagome ferromagnet within a family of metal–organic frameworks

Samuel A. Ivko, Katherine Tustain, Tristan Dolling, Aly Abdeldaim, Otto H. J. Mustonen, Pascal Manuel, Chennan Wang, Hubertus Luetkens, Lucy Clark

Research output: Contribution to journalArticlepeer-review

Abstract

Kagome networks of ferromagnetically or antiferromagnetically coupled S = ½ magnetic moments represent important models in the pursuit of a diverse array of novel quantum and topological states of matter. Here, we explore a family of Cu2+-containing metal–organic frameworks (MOFs) bearing S = ½  kagome layers pillared by ditopic organic linkers with the general formula Cu3(CO3)2(x)3·2ClO4 (MOF-x), where x is 1,2-bis(4-pyridyl)ethane (bpe), 1,2-bis(4-pyridyl)ethylene (bpy), or 4,4′-azopyridine (azpy). Despite more than a decade of investigation, the nature of the magnetic exchange interactions in these materials remained unclear, meaning that whether the underlying magnetic model is that of an S = ½ kagome ferromagnet or antiferromagnet is unknown. Using single-crystal X-ray diffraction, we have developed a chemically intuitive crystal structure for this family of materials. Then, through a combination of magnetic susceptibility, powder neutron diffraction, and muon-spin spectroscopy measurements, we show that the magnetic ground state of this family consists of S = ½  ferromagnetic kagome layers that are coupled antiferromagnetically via their extended organic pillaring linkers.
Original languageEnglish
Pages (from-to)5409–5421
Number of pages13
JournalChemistry of Materials
Volume34
Issue number12
Early online date9 Jun 2022
DOIs
Publication statusPublished - 28 Jun 2022

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