Nuclear spin dynamics in the quantum regime of a single-molecule magnet

We show that the nuclear spin dynamics in the single-molecule magnet Mn12-ac below 1 K is governed by quantum tunneling fluctuations of the cluster spins, combined with intercluster nuclear spin diffusion. We also obtain the first experimental proof that - surprisingly - even deep in the quantum reg...

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Bibliographic Details
Published in:arXiv.org 2004-11
Main Authors: Morello, Andrea, Bakharev, Oleg N, Brom, Hans B, Sessoli, Roberta, L Jos de Jongh
Format: Article
Language:English
Subjects:
Nuclear spin
Quantum tunnelling
Spin dynamics
Variations
Online Access:Get full text
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Summary:We show that the nuclear spin dynamics in the single-molecule magnet Mn12-ac below 1 K is governed by quantum tunneling fluctuations of the cluster spins, combined with intercluster nuclear spin diffusion. We also obtain the first experimental proof that - surprisingly - even deep in the quantum regime the nuclear spins remain in good thermal contact with the lattice phonons. We propose a simple model for how T-independent tunneling fluctuations can relax the nuclear polarization to the lattice, that may serve as a framework for more sophisticated theories.
ISSN:2331-8422
DOI:10.48550/arxiv.0403107