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