title: Oxalate-mediated long-range antiferromagnetism order in Fe2(C2O4)3·4H2O.
abstract: In this paper we reveal for the first time the magnetic properties of iron oxalate tetrahydrate, a compound commercialized for decades but whose structure was solved only recently. Susceptibility measurements and neutron powder diffraction experiments reveal the establishment of a long-range magnetic order below 25 K. The magnetic structure can be described with a propagation vector k = (½, ½, 0). The magnetic ordered phase is characterized by collinear antiferromagnetic couplings between adjacent Fe(3+) atoms, whatever the chelating mode of the oxalate ligand. Moreover, an analysis of the topology reveals that a fourth Fe-Fe magnetic coupling has to be taken into account to generate 3D long range order.
authors.affiliation: UMR 8260, Chimie du Solide et de l'Energie, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France. gwenaelle.rousse@college-de-france.fr.
authors.forename: G
authors.initials: G
authors.lastname: Rousse
authors.forename: J
authors.initials: J
authors.lastname: Rodríguez-Carvajal