Hyperfine Interactions in CeB_<b>6</b>

Abstract

It is shown that the main origin of the hyperfine field at B nuclei in CeB 6 is the transferred hyperfine interaction of the nuclear moment with the electronic spin carried by the electrons in the 2 s and 2 p states of the B ion hybridized with the 4 f states of neighboring Ce ions. The dipole-dipole interaction with the magnetic moments of Ce ions also contributes substantially. In the antiferro-quadrupolar ordering phase II, it is essential to assume the ordering of Γ 5 -type moments. The reason why the RKKY interaction between the Γ 5 -type quadrupole moments is strongest is also discussed, on the basis of the estimate of the strength of p-f mixing which plays a vital role in many respects in CeB 6 .