Spin dynamics and coherent tunnelling in the molecular magnetic rings Fe_6 and Fe_8

Details Spin dynamics and coherent tunnelling in the molecular magnetic rings Fe_6 and Fe_8 Spin dynamics and coherent tunnelling in the molecular magnetic rings Fe_6 and Fe_8

2001-09-11

arxiv.org/abs/cond-mat/0109201v2

Eur. Phys. J. B 27, 487 (2002).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 8 figures; considerably expanded discussion; to appear in Eur. Phys. J. B

Scientific paper

10.1140/epjb/e2002-00182-1

We present detailed calculations of low-energy spin dynamics in the ``ferric wheel'' systems Na:Fe_6 and Cs:Fe_8 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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