Butterfly hysteresis loop and dissipative spilt reversal in the S = 1/2, V-15 molecular complex

Time resolved magnetization measurements have been performed on a spin 1/2 molecular complex, so-called V-15. Despite the absence of a barrier, magnet ic 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 fluct uations and splittings are of the same energy. Spin-phonon coupling leads t o long relaxation times and to a particular "butterfly" hysteresis loop.