Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-08-11
Phys. Rev. B 72, 224433 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 8 figures, resubmitted to Phys. Rev. B with minor changes
Scientific paper
10.1103/PhysRevB.72.224433
We present an experimental study of the {\em nonlinear} susceptibility of Mn$_{12}$ single-molecule magnets. We investigate both their thermal-equilibrium and dynamical nonlinear responses. The equilibrium results show the sensitivity of the nonlinear susceptibility to the magnetic anisotropy, which is nearly absent in the linear response for axes distributed at random. The nonlinear dynamic response of Mn$_{12}$ was recently found to be very large and displaying peaks reversed with respect to classical superparamagnets [F. Luis {\em et al.}, Phys. Rev. Lett. {\bf 92}, 107201 (2004)]. Here we corroborate the proposed explanation -- strong field dependence of the relaxation rate due to the detuning of tunnel energy levels. This is done by studying the orientational dependence of the nonlinear susceptibility, which permits to isolate the quantum detuning contribution. Besides, from the analysis of the longitudinal and transverse contributions we estimate a bound for the decoherence time due to the coupling to the phonon bath.
Garcia-Palacios J. L.
Gonzalez Valentino
López-Ruiz Ricardo
Luis Fernando
Millan A.
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