Spin dynamics and coherent tunnelling in the molecular magnetic rings Fe6 and Fe8
A. Honecker, F. Meier, Daniel Loss, B. Normand
Abstract
We present detailed calculations of low-energy spin dynamics in the ``ferric wheel'' systems Na:Fe6 and Cs:Fe8 in a magnetic field. We compute by exact diagonalisation the low-energy spectra and matrix elements for total-spin and N'eel-vector components, and thus the time-dependent correlation functions of these operators. Comparison of our results with the semiclassical theory of coherent quantum tunnelling of the N'eel vector demonstrates the validity of a two-state description for the low-energy dynamics of ferric wheels. We discuss the implications of our results for mesoscopic quantum coherent phenomena, and for the experimental techniques to observe them, in molecular magnetic rings.
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