Quadrupolar and magnetic ordering in CeB6

The quadrupolar ordering in CeB6 is explained in terms of the electrostatic interaction of quadrupolar moments arranged into a simple cubic lattice. The representation of magnetic and quadrupolar moments by means of quasispins of two kinds is employed. A linear increase of the quadrupolar transition temperature T-Q(H) with applied magnetic field and its further reentrance are described using a generalized spherical model which is well adjusted to a particular problem of the quadrupolar ordering in CeB6. The theory naturally explains the growing specific heat jump at T-Q(H) with increasing magnetic field. The role of the quadrupolar ordering in the formation of the magnetic ordering, as well as the possible critical experiments and applications to other race-earth compounds, are discussed.