Magnetic long-range order induced by quantum relaxation in single-molecule magnets

Details Magnetic long-range order induced by quantum relaxation in single-molecule magnets Magnetic long-range order induced by quantum relaxation in single-molecule magnets

2004-02-14

arxiv.org/abs/cond-mat/0402388v1

Phys. Rev. Lett. 93, 117202 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.93.117202

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.

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