Complex-Orbital Ordering and Verwey Transition in Fe_3O_4

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Abstract

The charge and orbital orderings above and below the Verwey transition in magnetite (Fe<SUB>3</SUB>O<SUB>4</SUB>) have been investigated using a three-band model for electrons with minority spins in the <I>t</I><SUB>2<I>g</I></SUB> orbitals on the <I>B</I> sites with a mean-field approximation. For the high-temperature phase above the Verwey transition, an orbital ordered state with spontaneous breaking of the time reversal symmetry having noncollinear orbital moments is obtained as the lowest energy solution. The result is in contrast to usual magnetic materials, in which the orbital moments are induced by ordered spins via the spin–orbit interaction. For the low-temperature phase, a similar orbital ordering with longer periodicity accompanied by charge disproportionation caused by a monoclinic lattice distortion is proposed.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 75(4), "43704-1"-"43704-4", 2006-04-15

    The Physical Society of Japan (JPS)

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Codes

  • NII Article ID (NAID)
    110004729247
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    SHO
  • ISSN
    00319015
  • NDL Article ID
    7882234
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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