Evangelisti, MarcoLuis Vitalla, FernandoMettes, F. L.Aliaga-Alcalde, NúriaAromí Bedmar, GuillemAlonso, J. J.Christou, G.Jongh, L. J. de2010-07-052010-07-0520040031-9007https://hdl.handle.net/2445/13274Can magnetic interactions between single-molecule magnets (SMMs) in a crystal establish long-range magnetic order at low temperatures deep in the quantum regime, where the only electron spin fluctuations are due to incoherent magnetic quantum tunneling (MQT)? Put inversely: can MQT provide the temperature dependent fluctuations needed to destroy the ordered state above some finite Tc, although it should basically itself be a T-independent process? Our experiments on two novel Mn4 SMMs provide a positive answer to the above, showing at the same time that MQT in the SMMs has to involve spin-lattice coupling at a relaxation rate equaling that predicted and observed recently for nuclear-spin-mediated quantum relaxation.4 p.application/pdfeng(c) American Physical Society, 2004MaterialsPropietats magnètiquesMagnetic properties and materialsinfo:eu-repo/semantics/article532927info:eu-repo/semantics/openAccess