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Abstract:
Motivated by the unusual evolution of magnetic phases in stoichiometric
and Co-doped YbRh2Si2, we study Heisenberg models with competing
ferromagnetic and antiferromagnetic ordering combined with competing
anisotropies in exchange interactions and g factors. Utilizing
large-scale classical Monte Carlo simulations, we analyze the
ingredients required to obtain the characteristic crossing point of
uniform susceptibilities observed experimentally near the ferromagnetic
ordering of Yb(Rh0.73Co0.27)(2)Si-2. The models possess multicritical
points, which we speculate to be relevant for the behavior of clean as
well as doped YbRh2Si2. We also make contact with experimental data on
YbNi4P2, where a similar susceptibility crossing has been observed.
