Affiliation:
1. Max Planck Institute for the Physics of Complex Systems
2. National Academy of Sciences of Ukraine
3. University of Warwick
Abstract
A complex, seven-parameter ground-state problem for an Ising model on
a 3D honeycomb zigzag-ladder lattice, containing two types of magnetic
sites, is considered in the presence of an external field using the
method of basic rays and basic sets of cluster configurations. It is
shown that the geometrical frustration due to the presence of triangle
elements leads to the emergence of a large variety of magnetic phases,
the majority of which are highly degenerate. The obtained theoretical
results are used to elucidate the sequence of phase transitions in the
family of rare-earth oxides with a honeycomb zigzag-ladder lattice,
SrRE_\mathbf{2}2O_\mathbf{4}4
and BaRE_\mathbf{2}2O_\mathbf{4}4.
New phases predicted by our model and observed experimentally do not
appear in previously considered simpler models for noninteracting
zigzag-ladders.
Cited by
1 articles.
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