The effect of doped ions on single-molecule magnets of the Mn₁₂-Ac family

This paper investigates the single-molecule magnets of pure and Cr/Fe-doped Mn_12-Ac. The components of the mixed crystals are identified by AC susceptibility technique. The ground-state spin and anisotropy parameters of doped Mn_12-Ac are obtained: (i) Mn_11Cr-Ac (S=19/2, D=0.62 K, B=0.0009 K, \varDelta=63 K), and (ii) Mn_11Fe-Ac (S=21/2, D=0.39 K, B=0.001 K, \varDelta=55 K). The single-ion origin of the magnetic anisotropy is discussed.