Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 15, Pages 3454-3457Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3454
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Time resolved magnetization measurements have been performed on a spin 1/2 molecular complex, so-called V-15. Despite the absence of a barrier, magnetic hysteresis is observed over a time scale of several seconds. A detailed analysis in terms of a dissipative two-level model is given, in which fluctuations and splittings are of the same energy. Spin-phonon coupling leads to long relaxation times and to a particular butterfly hysteresis loop.
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