Entangled Spin-Orbital Phases in the d9 Model
W. Brzezicki a and A.M. Oleśa, b
aMarian Smoluchowski Institute of Physics, Jagellonian University, W.S. Reymonta 4, PL-30059 Kraków, Poland
bMax-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany
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We investigate the phase diagrams of the spin-orbital d9 Kugel-Khomskii model for a bilayer and a monolayer square lattice using the Bethe-Peierls-Weiss method. For a bilayer we obtain valence bond phases with interlayer singlets, with alternating planar singlets, and two entangled spin-orbital phases, in addition to the antiferromagnetic and ferromagnetic order. Possibility of such entangled phases in a monolayer is under investigation at present.
DOI: 10.12693/APhysPolA.121.1045
PACS numbers: 75.10.Jm, 03.65.Ud, 64.70.Tg, 75.25.Dk