Butterfly hysteresis loop and dissipative spin reversal in the S=1/2, V15 molecular complex
I. Chiorescu, W. Wernsdorfer, A. Müller, H. Bögge, B. Barbara
Abstract
Time resolved magnetization measurements have been performed on a spin 1/2 molecular complex, so called V15. Despite the absence of a barrier, magnetic hysteresis is observed over a timescale of several seconds. A detailed analysis in terms of a dissipative two level model is given, in which fluctuations and splittings are of same energy. Spin-phonon coupling leads to long relaxation times and to a particular "butterfly" hysteresis loop.
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