Single Molecule Magnets and the Lipkin-Meshkov-Glick model
  We discuss the description of quantum magnetization in the super paramagnetic compound Fe$_8$ using a generalization of the Lipkin-Meshkov-Glick Hamiltonian. We study the variation of the energy spectra and of the wave-functions as functions of the intensity of an external magnetic field along the three magnetic anisotropy axes. 
Jorge A. Campos, Jorge G. Hirsch
quant-ph cond-mat.mes-hall