'Hole-digging' in ensembles of tunneling Molecular Magnets

Abstract

The nuclear spin-mediated quantum relaxation of ensembles of tunneling magnetic molecules causes a 'hole' to appear in the distribution of internal fields in the system. The form of this hole, and its time evolution, are studied using Monte Carlo simulations. It is shown that the line-shape of the tunneling hole in a weakly polarised sample must have a Lorentzian lineshape- the short-time half-width ${\xi }_o$ in all experiments done so far should be $\sim E_0$, the half-width of the nuclear spin multiplet. After a time ${\tau }_o$, the single molecule tunneling relaxation time, the hole width begins to increase rapidly. In initially polarised samples the disintegration of resonant tunneling surfaces is found to be very fast.

4 pages, 5 figures

References in corpus (4)

• Coherence Window in the dynamics of Quantum Nanomagnets
• Quantum tunnelling of magnetization in Mn12-ac studied by 55Mn NMR
• Tunneling Splittings in Mn12-Acetate Single Crystals
• Crossovers in spin-boson and central spin models

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• A Gallery of Soft Modes: Theory and Experiment at a Ferromagnetic Quantum Phase Transition
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