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28 March 2024
 
  » arxiv » cond-mat/0407738

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Large quantum nonlinear dynamic susceptibility of single-molecule magnets
F. Luis ; V. Gonzalez ; A. Millan ; J. L. Garcia-Palacios ;
Date 28 Jul 2004
Journal Phys. Rev. Lett. 92, 107201 (2004) DOI: 10.1103/PhysRevLett.92.107201
Subject Mesoscopic Systems and Quantum Hall Effect; Materials Science | cond-mat.mes-hall cond-mat.mtrl-sci
AbstractThe 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.
Source arXiv, cond-mat/0407738
Other source [GID 154992] pmid15089236
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