Abstract
A high-frequency electron paramagnetic resonance (EPR) study of a single-molecule magnet, [Mn12O12(CH3COO)16(H2O)4]·2CH3COOH·4H2O, has been performed. The analysis of the spectra obtained at several frequencies led to an accurate description of the ground spin multiplet. Especially the determination of the fourth-order terms of the crystal field interaction explains some important features of the magnetic properties of the system. Lower-temperature measurements (T <2 K) have shown a new signal, probably associated to a minority species always present in the Mn12 crystals. Time-dependent measurements indicate that the molecules responsible for this signal play a role in the relaxation of the magnetization of Mnl2.
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