paper

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

arXiv:cond-mat/9901290 · doi:10.1103/PhysRevLett.82.3903

Abstract

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(ξ_H) of magnetic energy bias ξ_H$ acting on the molecules. Tunneling initially causes rapid transitions of molecules, thereby digging a hole in P(ξ_H) (around the resonant condition ξ_H = 0). For small initial magnetization values, the hole width shows an intrinsic broadening which may be due to nuclear spins.

4 pages, 6 figures

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