Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102391
Title: Spin-orbital interaction for face-sharing octahedra: Realization of a highly symmetric SU(4) model
Authors: Kugel, K. I.
Khomskii, D. I.
Sboychakov, A. O.
Streltsov, S. V.
Issue Date: 2015
Publisher: American Physical Society
Citation: Spin-orbital interaction for face-sharing octahedra: Realization of a highly symmetric SU(4) model / K. I. Kugel, D. I. Khomskii, A. O. Sboychakov, et al. — DOI 10.1103/PhysRevB.91.155125 // Physical Review B - Condensed Matter and Materials Physics. — 2015. — Vol. 91. — Iss. 15. — 155125.
Abstract: Specific features of orbital and spin structure of transition-metal compounds in the case of the face-sharing MO6 octahedra are analyzed. In this geometry, we consider the form of the spin-orbital Hamiltonian for transition-metal ions with double (egσ) or triple (t2g) orbital degeneracy. Trigonal distortions typical of the structures with face-sharing octahedra lead to splitting of t2g orbitals into an a1g singlet and egπ doublet. For both doublets (egσ and egπ), in the case of one electron or hole per site, we arrive at a symmetric model with the orbital and spin interaction of the Heisenberg type and the Hamiltonian of unexpectedly high symmetry: SU(4). Thus, many real materials with this geometry can serve as a testing ground for checking the prediction of this interesting theoretical model. We also compare general trends in the spin-orbital ("Kugel-Khomskii") exchange interaction for three typical situations: those of MO6 octahedra with common corner, common edge, and the present case of common face, which has not been considered yet. © 2015 American Physical Society.
URI: http://hdl.handle.net/10995/102391
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84929093819
PURE ID: 344104
31d32436-c6ad-4c68-ade0-eea56611645d
ISSN: 10980121
DOI: 10.1103/PhysRevB.91.155125
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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