Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-09-22
EPL 96, 27001 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 5 figures; accepted in EPL
Scientific paper
10.1209/0295-5075/96/27001
We derive a realistic spin-orbital model at finite Hund's exchange for alkali hyperoxides. We find that, due to the geometric frustration of the oxygen lattice, spin and orbital waves destabilize both spin and p-orbital order in almost all potential ground states. We show that the orbital order induced by the lattice overrules the one favoured by superexchange and that this, together with the large interorbital hopping, leads to generalized Goodenough-Kanamori rules. They (i) lift the geometric frustration of the lattice, and (ii) explain the observed layered C-type antiferromagnetic order in alkali hyperoxides. This is confirmed by a spin-wave dispersion with no soft-mode behavior presented here as a prediction for future experiments.
Daghofer Maria
Oles' Andrzej M.
Wohlfeld Krzysztof
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