Direct Identification of the Minority and Majority Species in the Single-Molecule Magnet Mn_(12)-Acetate by Inelastic Neutron Scattering

摘要

Our field-dependent inelastic neutron scattering experiment on an array of oriented single crystals of Mn_(12)-acetate provides unambiguous evidence that the minority species observed in the INS spectra indeed is the fast-relaxing species observed, for instance, in AC-susceptibility measurements. Together with the previous pressure-dependent INS experiment, the anisotropy parameters of the fast-relaxing species of Mn_(12)-acetate are now known precisely: D = -0.0360(1) meV and B_4~0 = -4(1) x 10~(-6) meV. This should enable a better understanding of the structural origin of the easy-axis anisotropy parameter D and the slow magnetic relaxation in the prototypical SMM Mn_(12)-acetate in the future.