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Phys Rev Lett. 2008 Jun 20;100(24):247205. Epub 2008 Jun 18.

Spin chirality in a molecular dysprosium triangle: the archetype of the noncollinear ising model.

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  • 1Laboratory of Molecular Magnetism, Department of Chemistry and INSTM (UdR Firenze), Universit√° degli Studi di Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy.


Single crystal magnetic studies combined with a theoretical analysis show that cancellation of the magnetic moments in the trinuclear Dy3+ cluster [Dy{3}(mu{3}-OH)2L3Cl(H2O){5}]Cl{3}, resulting in a nonmagnetic ground doublet, originates from the noncollinearity of the single-ion easy axes of magnetization of the Dy3+ ions that lie in the plane of the triangle at 120 degrees one from each other. This gives rise to a peculiar chiral nature of the ground nonmagnetic doublet and to slow relaxation of the magnetization with abrupt accelerations at the crossings of the discrete energy levels.

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