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Magnetic long-range order induced by quantum ralaxation in single-molecule magnets Evangelisti, Marco Luis Vitalla, Fernando Mettes, F. L. Aliaga-Alcalde, Núria Aromí Bedmar, Guillem Alonso, J. J. Christou, G. Jongh, L. J. de Materials Propietats magnètiques Magnetic properties and materials Can 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. 2010-07-05T09:35:20Z 2010-07-05T09:35:20Z 2004 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció digital del document proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevLett.93.117202 Physical Review Letters, 2004, vol. 93, núm. 11, p. 117202-1-117202-4 http://dx.doi.org/10.1103/PhysRevLett.93.117202 (c) American Physical Society, 2004 info:eu-repo/semantics/openAccess American Physical Society Articles publicats en revistes (Química Inorgànica i Orgànica)