Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-08-24
Europhysics Letters, 49(4), 521 (2000)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 4 figures, submitted to Europhys. Lett
Scientific paper
10.1209/epl/i2000-00181-4
Precise magnetic hysteresis measurements of small single crystals of Mn$_{12}$ acetate of spin 10 have been conducted down to 0.4 K using a high sensitivity Hall magnetometer. At higher temperature (>1.6K) step-like changes in magnetization are observed at regularly spaced magnetic field intervals, as previously reported. However, on lowering the temperature the steps in magnetization shift to higher magnetic fields, initially gradually. These results are consistent with the presence of a second order uniaxial magnetic anisotropy, first observed by EPR spectroscopy, and thermally assisted tunnelling with tunnelling relaxation occurring from levels of progressively lower energy as the temperature is reduced. At lower temperature an abrupt shift in step positions is found. We suggest that this shift may be the first evidence of an abrupt, or first-order, transition between thermally assisted and pure quantum tunnelling, suggested by recent theory.
Bokacheva Louisa
Hendrickson David N.
Kent Andrew D.
Ruiz Daniel
Sarachik Myriam P.
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