Direct Observation of Quantum Tunneling and Relaxation in Mn12ac
M. Dressel, B. Gorshunov, K. Rajagopal, S. Vongtragool, A. A. Mukhin
Abstract
The spin relaxation in the molecular magnet 12 is investigated by a novel type of high-frequency magnetic spectroscopy. By reversing the external magnetic field the intensities of the | 10> | 9> transitions within the ground multiplet redistribute; below T≈ 2 K resonant quantum tunneling is directly observed as magnetic hole burning in the absorption spectra of a polycrystal. We quantitatively describe our observations by taking into account inhomogeneous line broadening, the time dependence of the level population during the relaxation process, and the resonance behavior of the relaxation rate due to quantum tunneling near the avoided level crossing.
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