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  • Title: Orbital ordering in charge transfer insulators.
    Author: Mostovoy MV, Khomskii DI.
    Journal: Phys Rev Lett; 2004 Apr 23; 92(16):167201. PubMed ID: 15169254.
    Abstract:
    We discuss a new mechanism of orbital ordering, which in charge transfer insulators is more important than the usual exchange interactions and which can make the very type of the ground state of a charge transfer insulator, i.e., its orbital and magnetic ordering, different from that of a Mott-Hubbard insulator. This purely electronic mechanism allows us to explain why orbitals in Jahn-Teller materials typically order at higher temperatures than spins, and to understand the type of orbital ordering in a number of materials, e.g., K2CuF4, without invoking the electron-lattice interaction.
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