  Neutron scattering experiments on frustrated fcc - antiferromagnet HoB$_{12}$
have been performed above T$_{N}$ = 7.4 K. Diffuse scattering patterns indicate
that above Neel temperature correlations between neighboring magnetic moments
of Ho - ions appear, similar to the appearance of coupled spin-pairs (dimers)
in low dimensional magnets. Moreover, the diffuse patterns show a symmetry
reduction from fcc to simple cubic. Analogous behavior in 3D systems is not
known, although it was predicted by theory. The role of various interactions
leading to this behavior is being analyzed and discussed.
