  Precise angle-resolved magnetoresistance (ARM) measurements are applied to
reveal the origin for the lowering of symmetry in electron transport and the
emergence of a huge number of magnetic phases in the ground state of
antiferromagnetic metal HoB12 with fcc crystal structure. By analyzing of the
polar H-theta-phi magnetic phase diagrams of this compound reconstructed from
the experimental ARM data we argue that non-equilibrium electron density
oscillations (dynamic charge stripes) are responsible for the suppression of
the indirect RKKY exchange along <110> directions between the nearest
neighboring magnetic moments of Ho3+ ions in this strongly correlated electron
system.
