Materialization of a Geometrically Frustrated Magnet in a Hybrid Coordination Framework: A Study of the Iron(II) Oxalate Fluoride Framework, KFe(C₂O₄)F

Tustain, Katherine, Farrar, Lewis, Yao, Wenjiao, Lightfoot, Philip, da Silva, Ivan, Telling, Mark TF and Clark, Lucy ORCID: 0000-0002-6223-3622 (2019) Materialization of a Geometrically Frustrated Magnet in a Hybrid Coordination Framework: A Study of the Iron(II) Oxalate Fluoride Framework, KFe(C₂O₄)F. INORGANIC CHEMISTRY, 58 (18). pp. 11971-11977.

Text KFe(C2O4)F-Main-Manuscript_15-05-19.pdf - Author Accepted Manuscript Download (1MB) | Preview

Abstract

Here we discuss magnetic hybrid coordination frameworks in relation to the realization of new geometrically frustrated magnets. In particular, we present the nuclear and magnetic structures of one such system-the Fe²⁺-based oxalate fluoride framework KFe(C₂O₄)F-through analysis of the powder neutron diffraction and muon spectroscopy data. KFe(C₂O₄)F retains an orthorhombic <i>Cmc</i>2₁ structure upon cooling to 2 K composed of quasi-one-dimensional iron fluoride chains connected to a distorted triangular network via oxalate anions. Previous magnetometry measurements of KFe(C₂O₄)F indicate that it is a strongly interacting system with a Weiss constant θ ≈ -300 K that undergoes a magnetic ordering transition at <i>T</i>_N ≈ 20 K, yielding a frustration index, <i>f</i> = |θ|/<i>T</i>_N ≈ 15, reflective of high-spin frustration. We determine the nature of this frustrated antiferromagnetic ordering below <i>T</i>_N and show that the resulting magnetic structure is best described by a model in the <i>Cmc</i>'2₁' magnetic space group.

Item Type:	Article
Depositing User:	Symplectic Admin
Date Deposited:	24 May 2019 12:05
Last Modified:	05 Feb 2024 17:37
DOI:	10.1021/acs.inorgchem.9b00571
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3042759