Nuclear spin driven resonant tunnelling of magnetisation in Mn12 acetate

Details Nuclear spin driven resonant tunnelling of magnetisation in Mn12 acetate Nuclear spin driven resonant tunnelling of magnetisation in Mn12 acetate

1999-04-30

arxiv.org/abs/cond-mat/9904450v1

Europhys. Lett. vol. 47, p. 254 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 6 figures, submitted to Europhys. Lett

Scientific paper

10.1209/epl/i1999-00380-5

Current theories still fail to give a satisfactory explanation of the observed quantum phenomena in the relaxation of the magnetisation of the molecular cluster Mn12 acetate. In the very low temperature regime, Prokof'ev and Stamp recently proposed that slowly changing dipolar fields and rapidly fluctuating hyperfine fields play a major role in the tunnelling process. By means of a faster relaxing minor species of Mn12ac and a new experimental 'hole digging' method, we measured the intrinsic line width broadening due to local fluctuating fields, and found strong evidence for the influence of nuclear spins on resonance tunnelling at very low temperatures (0.04 - 0.3K). At higher temperature (1.5 - 4K), we observed a homogeneous line width broadening of the resonance transitions being in agreement with a recent calculation of Leuenberger and Loss.

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