Many-spin effects and tunneling splittings in Mn12 magnetic molecules

Abstract

We calculate the tunneling splittings in a Mn${}_{12}$ magnetic molecule taking into account its internal many-spin structure. We discuss the precision and reliability of these calculations and show that restricting the basis (limiting the number of excitations taken into account) may lead to significant error (orders of magnitude) in the resulting tunneling splittings for the lowest energy levels, so that an intuitive picture of different decoupled energy scales does not hold in this case. Possible routes for further development of the many-spin model of Mn${}_{12}$ are discussed.

REVTeX4, 5 pages, 1 figure (PostScript). Version 2, substantially revised

References in corpus (5)

• Observation of the distribution of molecular spin states by resonant quantum tunneling of the magnetization
• Phonon-assisted tunneling in the quantum regime of Mn12-ac
• Many-Spin Interactions and Spin Excitations in Mn12
• Quantum spin chains in a magnetic field
• Many-Spin Effects and Tunneling Properties of Magnetic Molecules

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• Magnetic energy-level diagrams of high-spin (Mn${}_{12}$-acetate) and low-spin (V${}_{15}$) molecules
• Nuclear spin-lattice relaxation in ferrimagnetic clusters and chains: A contrast between zero and one dimensions
• Kramers degeneracy and relaxation in vanadium, niobium and tantalum clusters
• A DMI guide to magnets micro-world
• Thermodynamic observables of Mn12-acetate calculated for the full spin-Hamiltonian
• Macrospin approximation and quantum effects in models for magnetization reversal