Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-06-03
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 3 figures. Submitted to Phys. Rev. B, brief reports
Scientific paper
Quantum nanomagnets can show a field dependence of the relaxation time very different from their classical counterparts, due to resonant tunneling via excited states (near the anisotropy barrier top). The relaxation time then shows minima at the resonant fields H_{n}=n D at which the levels at both sides of the barrier become degenerate (D is the anisotropy constant). We showed that in Mn12, near zero field, this yields a contribution to the nonlinear susceptibility that makes it qualitatively different from the classical curves [Phys. Rev. B 72, 224433 (2005)]. Here we extend the experimental study to finite dc fields showing how the bias can trigger the system to display those quantum nonlinear responses, near the resonant fields, while recovering an classical-like behaviour for fields between them. The analysis of the experiments is done with heuristic expressions derived from simple balance equations and calculations with a Pauli-type quantum master equation.
Garcia-Palacios J. L.
López-Ruiz Ricardo
Luis Fernando
Millan A.
Rillo C.
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