Orbital ordering in charge transfer insulators

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-Hubba...

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Bibliographic Details
Published in:Physical review letters 2004-04, Vol.92 (16), p.167201-167201, Article 167201
Main Authors: Mostovoy, M V, Khomskii, D I
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.92.167201