Butterfly hysteresis loop and dissipative spin reversal in the S = 1/2, V15 molecular complex
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 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.
Chiorescu
I
Laboratoire de Magnetisme Louis Neel, CNRS, BP 166, 38042 Grenoble, France.
Wernsdorfer
W
Muller
A
Bogge
H
Barbara
B