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Magnetic long-range order induced by quantum relaxation in single-molecule magnets
M Evangelisti1, F Luis, F L Mettes
1Kamerlingh Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands. evange@unimore.it
Abstract:
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 T(c), 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.
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