Observation of an unusual equilibrium in the molecular nano-magnet Fe8
V. Villar, E. Lhotel, C. Sangregorio, C. Paulsen
Abstract
Magnetization measurements made in small fields as a function of temperature reveal an unusual equilibrium below 900 mK for the molecular nano-magnet Fe8. 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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