On the Theory of Ferromagnetism of Hexagonal Diborides

摘要

The electronic structure and the magnetic properties of the MnB_2 and CrB_2 compounds with hexagonal AlB_2-type lattices were studied. The problem was treated in terms of the generalized Hubbard model with an infinite electron-electron repulsion energy in the same atom. Equations for spin magnetic susceptibility were derived and used to determine the conditions of ferromagnetic instability and construct the phase diagram of the existence of ferromagnetic ordering.