Quantum tetrahedral mean field theory of the magnetic susceptibility for   the pyrochlore lattice
  A quantum mean field theory of the pyrochlore lattice is presented. The starting point is not the individual magnetic ions, as in the usual Curie-Weiss mean field theory, but a set of interacting corner sharing tetrahedra. We check the consistency of the model against magnetic susceptibility data, and find a good agreement between the theoretical predictions and the experimental data. Implications of the model and future extensions are also discussed. 
A.J. Garcia-Adeva and D.L. Huber