Observation of the distribution of molecular spin states by resonant quantum tunneling of the magnetization

Details Observation of the distribution of molecular spin states by resonant quantum tunneling of the magnetization Observation of the distribution of molecular spin states by resonant quantum tunneling of the magnetization

1999-01-26

arxiv.org/abs/cond-mat/9901290v1

Phys. Rev. Lett., 82, 3903 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.82.3903

Below 360 mK, Fe magnetic molecular clusters are in the pure quantum relaxation regime and we show that the predicted square-root time relaxation is obeyed, allowing us to develop a new method for watching the evolution of the distribution of molecular spin states in the sample. We measure as a function of applied field H the statistical distribution P(\xi_H) of magnetic energy bias \xi_H$ acting on the molecules. Tunneling initially causes rapid transitions of molecules, thereby digging a hole in P(\xi_H) (around the resonant condition \xi_H = 0). For small initial magnetization values, the hole width shows an intrinsic broadening which may be due to nuclear spins.

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