Magnetic properties of hexaamminecobalt(3+) hexachloroferrate(3-): a quasi-ideal fcc structure with antiferromagnetic ordering

Abstract

We report the magnetic properties of [Co(NH3)6][FeCl6], a bimetallic salt showing an fee antiferromagnetic frustrated lattice. The temperature dependence of the ac magnetic susceptibility, measured on a single crystal, indicates antiferromagnetic ordering at Tc = 0.50 ± 0.05 K, with a maximum at 0.80 ± 0.01 K. The analysis of the data gives values of Jnn/k = -0.068 ± 0.001 K for the first-neighbor interactions and Jnnn/k = 0.005 ± 0.001 K for the second-neighbor ones.