Quantum tunnelling of magnetization in Mn12-ac studied by 55Mn NMR

Details Quantum tunnelling of magnetization in Mn12-ac studied by 55Mn NMR Quantum tunnelling of magnetization in Mn12-ac studied by 55Mn NMR

2002-11-11

arxiv.org/abs/cond-mat/0211209v1

Polyhedron 22, 1745 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTex, 5 pages, 3 eps figures; presented at the Internation Conference on Molecular Magnets (Valencia, 5 - 10 Oct. 2002); to

Scientific paper

10.1016/S0277-5387(03)00199-2

We present an ultra-low temperature study (down to T = 20 mK) of the nuclear spin-lattice relaxation (SLR) in the 55Mn nuclei of the molecular magnet Mn12-ac. The nuclear spins act as local probes for the electronic spin fluctuations, due to thermal excitations and to tunnelling events. In the quantum regime (below T = 0.75 K), the nuclear SLR becomes temperature-independent and is driven by fluctuations of the cluster's electronic spin due to the quantum tunnelling of magnetization in the ground doublet. The quantitative analysis of the nuclear SLR shows that the presence of fast-tunnelling molecules, combined with nuclear intercluster spin diffusion, plays an important role in the relaxation process.

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