Smooth transition between SMM and SCM-type slow relaxing dynamics for a 1-D assemblage of {Dy(nitronyl nitroxide)2} units

Article abstract of DOI:10.1039/b918554b

A model example for size effects on the dynamic susceptibility behavior is provided by the chain compound [{Dy(hfac)₃NitPhIm₂} Dy(hfac)₃] (NitPhIm = 2-[4-(1-imidazole)phenyl]nitronyl nitroxide radical). The Arrhenius plot reveals two relaxation regimes attributed to SMM (Δ = 17.1 K and τ₀ = 17.5 × 10^-6 s) and SCM (Δ = 82.7 K and τ₀ = 8.8 × 10^-8 s) behaviors. The ferromagnetic exchange among the spin carriers has been established for the corresponding Gd derivative.