Giant Antiferromagnetically Coupled Moments in a Molecule-Based Magnet with...

The competing energy scales found in molecule-based magnets frequently give rise to novel magnetic behavior that is rarely seen in solid-state systems. [Ru2(O2CMe)4]3[Cr(CN)6] is an intriguing molecule-based magnet with weakly-coupled, interpenetrating lattices. The field-dependence of the magnetization of this compound is reminiscent of a metamagnetic transition from an antiferromagnet to a paramagnet, but unlike typical metamagnets like FeCl2 it also exhibits a magnetic remanance and coercive field. We demonstrate that this compound behaves like two giant moments with a weak antiferromagnetic coupling and a large energy barrier between the orientations of each moment.