On Ground State Tunneling in Mn$_{12}$-Acetate

Details On Ground State Tunneling in Mn$_{12}$-Acetate On Ground State Tunneling in Mn$_{12}$-Acetate

2001-08-10

arxiv.org/abs/cond-mat/0108185v2

Physics

Condensed Matter

5 pages including 4 figures. Minor revisions to clarify explanations

Scientific paper

10.1103/PhysRevB.65.212401

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 for a series of closely-spaced temperatures between 0.24 K and 1.9 K. We map out a region in the $H-T$ plane where ground state tunneling is observed, a region where tunneling proceeds via thermally-assisted tunneling, and a crossover region where both participate in the relaxation. We observe the occasional absence of ground-state tunneling under conditions where one would expect it to be present, and suggest a resolution to the enigma.

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