Spin dilution in a ferromagnetic chain

We have systematically introduced spinless defects in the quasi-one-dimensional ferromagnetic system decamethylferrocenium tetracyanoethanide, [FeCp(2*)] [TCNE]. The three-dimensional ordering temperature Tc decreases rapidly with the concentration of spinless sites. The rate of decrease of Tc with concentrate is in the order of the exchange spatial anisotropy (i.e., J interchain /J intrachain) of the parent system in accordance with long-standing theoretical predictions.