Large quantum nonlinear dynamic susceptibility of single-molecule magnets

Details Large quantum nonlinear dynamic susceptibility of single-molecule magnets Large quantum nonlinear dynamic susceptibility of single-molecule magnets

2004-07-28

arxiv.org/abs/cond-mat/0407738v1

Phys. Rev. Lett. 92, 107201 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.92.107201

The nonlinear dynamical response of Mn$_{12}$ single-molecule magnets is experimentally found to be very large, quite insensitive to the spin-lattice coupling constant, and displaying peaks reversed with respect to classical superparamagnets. It is shown that these features are caused by the strong field dependence of the relaxation rate due to the detuning of energy levels between which tunneling takes place. The nonlinear susceptibility technique, previously overlooked, is thus proposed as a privileged probe to ascertain the occurrence of quantum effects in mesoscopic magnetic systems.

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