Diabolical points in the magnetic spectrum of Fe8 molecules
Department of Physics and Astronomy,
Evanston, IL 60208, USA
Accepted: 8 March 2000
The magnetic molecule Fe8 has been predicted and observed to have a rich pattern of degeneracies in its spectrum as an external magnetic field is varied. These degeneracies have now been recognized to be diabolical points. This paper analyzes the diabolicity and all essential properties of this system using elementary perturbation theory. A variety of arguments is given to suggest that an earlier semiclassical result for a subset of these points may be exactly true for arbitrary spin.
PACS: 75.10.Dg – Crystal-field theory and spin Hamiltonians / 75.50.Xx – Molecular Magnets / 03.65.Bz – Foundations, theory of measurement, miscellaneous theories (including Aharonov-Bohm effect, Bell inequalities, Berry's phase)
© EDP Sciences, 2000