Magnetic structure and interactions in the quasi-one-dimensional antiferromagnet CaV2O4

TitleMagnetic structure and interactions in the quasi-one-dimensional antiferromagnet CaV2O4
Publication TypeJournal Article
Year of Publication2009
AuthorsPieper O, Lake B, Daoud-Aladine A, Reehuis M, Prokes K, Klemke B, Kiefer K, Yan JQ, Niazi A, Johnston DC, Honecker A
Journal TitlePhysical Review B
Volume79
Pages180409
Date Published05/01
ISBN Number1098-0121
Accession NumberISI:000266501200014
Keywordsantiferrimagnetism, calcium compounds, diffraction, exchange interactions (electron), frustration, magnetic structure, neutron diffraction, thermomagnetic effects, vanadite
Abstract

CaV2O4 is a spin-1 antiferromagnet, where the magnetic vanadium ions have an orbital degree of freedom and are arranged on quasi-one-dimensional zigzag chains. The first- and second-neighbor vanadium separations are approximately equal suggesting frustrated antiferromagnetic exchange interactions. High-temperature susceptibility and single-crystal neutron-diffraction measurements are used to deduce the dominant exchange paths and orbital configurations. The results suggest that at high temperatures CaV2O4 behaves as a Haldane chain, but at low temperatures, it is a spin-1 ladder. These two magnetic structures are explained by different orbital configurations and show how orbital ordering can drive a system from one exotic spin Hamiltonian to another.

URL<Go to ISI>://000266501200014
DOI10.1103/Physrevb.79.180409