Abstract

Magnetic relaxation measurements at different temperatures below the blocking temperature were performed on Mn12‐acetate in fields corresponding to the first (zero) resonance. Three temperature regimes could be identified: Below 2.0 K (2.3 K) a square root time dependence is present, indicating thermally assisted tunneling. Up to 2.1 K. (2.6 K.) pure exponential behavior is found, typical for thermally activated tunneling. Just below T B a new regime with strongly non exponential behavior could be identified.

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