Single crystal magnetic studies combined with a theoretical analysis show that cancellation of the magnetic moments in the trinuclear Dy3+ cluster [Dy3(OH)2L3Cl(H2O)5]Cl3, resulting in a non-magnetic ground doublet, originates from the non-collinearity of the single ion easy axes of magnetization of the Dy3+ ions that lie in the plane of the triangle at 120 (deg.) one from each other. This gives rise to a peculiar chiral nature of the ground non-magnetic doublet and to slow relaxation of the magnetization with abrupt accelerations at the crossings of the discrete energy levels.
@article{arxiv.0804.1272,
title = {Spin Chirality in a Molecular Dysprosium Triangle: the Archetype of the Non-Collinear Ising Model},
author = {Javier Luzon and Kevin Bernot and Ian J. Hewitt and Christopher E. Anson and Annie K. Powell and Roberta Sessoli},
journal= {arXiv preprint arXiv:0804.1272},
year = {2009}
}