Abstract
We present results of neutron scattering experiments on frustrated antiferromagnet HoB 12 above and below Néel temperature T N. Diffuse scattering patterns indicate that above T N=7.4 K pronounced correlations between neighboring magnetic moments of Ho-ions appear, similar to one-dimensional (1D) magnets. Moreover, the diffuse scattering patterns show a symmetry reduction from fcc to simple cubic. Analogous behavior in three dimensional (3-D) systems is not known, although it was predicted by theory. Results below T N and in applied magnetic field, on the other hand, reveal three amplitude-modulated incommensurate magnetic structures in this compound. The role of various interactions leading to this behavior (above and below T N) is being discussed. Additional attention is paid also to ρ(T) resistivity dependencies in various magnetic fields close to and above the quantum critical point.
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