Observation of an unusual equilibrium in the molecular nano-magnet Fe_8

Details Observation of an unusual equilibrium in the molecular nano-magnet Fe_8 Observation of an unusual equilibrium in the molecular nano-magnet Fe_8

2005-08-05

arxiv.org/abs/cond-mat/0508157v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures

Scientific paper

Magnetization measurements made in small fields as a function of temperature reveal an unusual equilibrium below 900 mK for the molecular nano-magnet Fe_8. Measurements of the relaxation of the magnetization demonstrate that the approach to the equilibrium is non-trivial and suggest that a competition exists between quantum tunneling of the giant spins and thermodynamic behavior. As a result, at very low temperature the entropy of the spin system remains very large.

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