Abstract
Motivated by the unusual evolution of magnetic phases in stoichiometric and Co-doped , we study Heisenberg models with competing ferromagnetic and antiferromagnetic ordering combined with competing anisotropies in exchange interactions and 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 . The models possess multicritical points, which we speculate to be relevant for the behavior of clean as well as doped . We also make contact with experimental data on , where a similar susceptibility crossing has been observed.
- Received 20 December 2013
- Revised 11 August 2014
DOI:https://doi.org/10.1103/PhysRevB.90.075138
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