Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-03-24
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, PRB accepted
Scientific paper
10.1103/PhysRevB.63.214408
We report the far-infrared spectra of the molecular nanomagnet Mn_12-acetate (Mn_12) as a function of temperature (5-300 K) and magnetic field (0-17 T). The large number of observed vibrational modes is related to the low symmetry of the molecule, and they are grouped together in clusters. Analysis of the mode character based on molecular dynamics simulations and model compound studies shows that all vibrations are complex; motion from a majority of atoms in the molecule contribute to most modes. Three features involving intramolecular vibrations of the Mn_12 molecule centered at 284, 306 and 409 cm-1 show changes with applied magnetic field. The structure near 284 cm$^{-1}$ displays the largest deviation with field and is mainly intensity related. A comparison between the temperature dependent absorption difference spectra, the gradual low-temperature cluster framework distortion as assessed by neutron diffraction data, and field dependent absorption difference spectra suggests that this mode may involve Mn motion in the crown.
Achey R. M.
Dalal Naresh S.
Jones Ray B.
Musfeldt J. L.
Sushkov Andrei B.
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