Phonon-assisted tunneling in the quantum regime of Mn12-ac

Abstract

Longitudinal or transverse magnetic fields applied on a crystal of Mn12-ac allows to observe independent tunnel transitions between m=-S+p and m=S-n-p (n=6-10, p=0-2 in longitudinal field and n=p=0 in transverse field). We observe a smooth transition (in longitudinal) from coherent ground-state to thermally activated tunneling. Furthermore two ground-state relaxation regimes showing a crossover between quantum spin relaxation far from equilibrium and near equilibrium, when the environment destroys multimolecule correlations. Finally, we stress that the complete Hamiltonian of Mn12 should contain odd spin operators of low order.

References in corpus (2)

• Butterfly hysteresis loop and dissipative spin reversal in the S=1/2, V15 molecular complex
• Low temperature magnetic hysteresis in Mn${}_{12}$ acetate single crystals

Cited by in corpus (28)

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• Exchange Interactions and High-Energy Spin States in Mn_12-acetate
• Magnetic long-range order induced by quantum relaxation in single-molecule magnets
• Nuclear spin dynamics in the quantum regime of a single-molecule magnet
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