Longitudinal or transverse magnetic fields applied on a crystal of Mn-12 acetate allows one 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 tin longitudinal) from coherent ground-state to thermally activated tunneling. Furthermore, two ground;state relaxation regimes show 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 Mn-12 should contain odd spin operators of low order.
Phonon Assisted Tunneling in the Quantum Regime of Mn12 Acetate / I. CHIORESCU; R. GIRAUD; A.G.M. JANSEN; A. CANESCHI; B. BARBARA. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 85:(2000), pp. 4807-4810. [10.1103/PhysRevLett.85.4807]
Phonon Assisted Tunneling in the Quantum Regime of Mn12 Acetate
CANESCHI, ANDREA;
2000
Abstract
Longitudinal or transverse magnetic fields applied on a crystal of Mn-12 acetate allows one 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 tin longitudinal) from coherent ground-state to thermally activated tunneling. Furthermore, two ground;state relaxation regimes show 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 Mn-12 should contain odd spin operators of low order.File | Dimensione | Formato | |
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