Abrupt Transition between Thermally-Activated Relaxation and Quantum Tunneling in a Molecular Magnet

Details Abrupt Transition between Thermally-Activated Relaxation and Quantum Tunneling in a Molecular Magnet Abrupt Transition between Thermally-Activated Relaxation and Quantum Tunneling in a Molecular Magnet

2000-12-13

arxiv.org/abs/cond-mat/0012247v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, including 7 figures

Scientific paper

10.1209/epl/i2001-00363-0

We report Hall sensor measurements of the magnetic relaxation of Mn$_{12}$ acetate as a function of magnetic field applied along the easy axis of magnetization. Data taken at a series of closely-spaced temperatures between 0.24 K and 1.4 K provide strong new evidence for an abrupt ``first-order'' transition between thermally-assisted relaxation and magnetic decay via quantum tunneling.

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