title: Frustrated magnetism and local structural disorder in pyrochlore-type Bi1.89Fe1.16Nb0.95O6.95.
abstract: The magnetic properties of pyrochlore-type Bi(1.89)Fe(1.16)Nb(0.95)O(6.95) have been investigated for the first time using AC and DC susceptibility. The compound is shown to behave as a classical spin glass due to strong competition/coexistence of ferro- and antiferromagnetic exchange. The study was accompanied by the first-ever growth of single crystals of this compound using the floating-zone method, allowing us to carry out a single-crystal neutron diffraction experiment that confirmed and extended our understanding of local structural disorder, driven by the stereochemically active 6s(2) electron lone pair on Bi(3+) ions. The magnetic properties are discussed in terms of both the topologically frustrated Fe(3+) lattice and the role of this local structural disorder.
authors.affiliation: School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia. w.miiller@chem.usyd.edu.au
authors.forename: W
authors.initials: W
authors.lastname: Miiller
authors.forename: L
authors.initials: L
authors.lastname: Causeret
authors.forename: C D
authors.initials: CD
authors.lastname: Ling