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An unusual field dependent slow magnetic relaxation and two distincttransitions were observed in a family of new rare earth-transition metalcomplexes, [Ln (bipy) (H$_{2}$O)$_{4}$ M(CN)$_{6}$] $\cdot $1.5 (bipy) $ \cdot$ 4H$_{2}$O (bipy = 2,2'-bipyridine; Ln = Gd$^{3+}$,Y$^{3+}$; M = Fe$ ^{3+}$,Co$^{3+}$). The novel magnetic relaxation, which is quite different from thosein normal spin glasses and superparamagnets but very resembles qualitativelythose in single-molecule magnet Mn$_{12}$-Ac even if they possess differentstructures, might be attributed to the presence of frustration that isincrementally unveiled by the external magnetic field. The two distincttransitions in [GdFe] were presumed from DC and AC susceptibility as well asheat capacity measurements.Comment: Revtex, 6 figure

Observation of an unusual field-dependent slow magnetic relaxation and two distinct transitions in a family of rare-earth–transition-metal complexes