Abstract:
We observed non-exponential relaxation for a quantum tunneling molecular magnetic system at very low temperatures and argue that it results from evolving intermolecular dipole fields. At the very beginning of the relaxation, the magnetization follows a square-root time dependence. A simple model is developed for the intermediate time range that is in good agreement with the data over 4 decades in time. Detailed numerical calculations as well as measurements are presented which indicate unusual correlation effects in these systems.
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Received: 15 May 1998 / Revised: 10 July 1998 / Accepted: 11 July 1998
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Ohm, T., Sangregorio, C. & Paulsen, C. Local field dynamics in a resonant quantum tunneling system of magnetic molecules. Eur. Phys. J. B 6, 195–199 (1998). https://doi.org/10.1007/s100510050541
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DOI: https://doi.org/10.1007/s100510050541