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

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

2000-11-16

arxiv.org/abs/cond-mat/0011289v1

Phys. Rev. Lett., vol. 85, issue 22, p. 4807-4810

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.85.4807

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.

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