Magnetic excitations and orbital physics in the ferrimagnetic spinels Mn B2 O4 (B=Mn,V)

J. H. Chung, J. H. Kim, S. H. Lee, T. J. Sato, T. Suzuki, M. Katsumura, Takuro Katsufuji

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    Abstract

    Using neutron scattering techniques, we have investigated spin wave excitations in noncollinear ferrimagnetic spinels Mn B2 O4 (B=Mn,V) with eg and t2g orbital degeneracies, respectively, that lead to tetragonal distortions along opposite directions. Linear spin wave analysis of the excitations yields spatially inhomogeneous nearest neighbor interactions in both tetragonal spinels. We find the ratio Jc Jab ≈-0.06 (4) for Mn3 O4 (c>a=b) and ≈0.3 (1) for Mn V2 O4 (c<a=b). Resulting exchange couplings of Mn3 O4 can be qualitatively explained in terms of possible overlaps of t2g and eg electrons of Mn2+ and Mn3+ ions. On the other hand, those of Mn V2 O4, in particular, the strong Jc, seem to contradict with the antiferro-orbital state of V3+ (t 2g 2) ions that was proposed by a recent synchrotron x-ray study. Theoretical implications to the orbital physics are also discussed.

    Original languageEnglish
    Article number054412
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume77
    Issue number5
    DOIs
    Publication statusPublished - 2008 Feb 8

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    Spin waves
    Physics
    Ions
    orbitals
    Exchange coupling
    magnons
    physics
    Neutron scattering
    Synchrotrons
    excitation
    wave excitation
    X rays
    Electrons
    synchrotrons
    ions
    neutron scattering
    electrons
    x rays
    interactions
    Direction compound

    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

    Magnetic excitations and orbital physics in the ferrimagnetic spinels Mn B2 O4 (B=Mn,V). / Chung, J. H.; Kim, J. H.; Lee, S. H.; Sato, T. J.; Suzuki, T.; Katsumura, M.; Katsufuji, Takuro.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 77, No. 5, 054412, 08.02.2008.

    Research output: Contribution to journalArticle

    Chung, J. H. ; Kim, J. H. ; Lee, S. H. ; Sato, T. J. ; Suzuki, T. ; Katsumura, M. ; Katsufuji, Takuro. / Magnetic excitations and orbital physics in the ferrimagnetic spinels Mn B2 O4 (B=Mn,V). In: Physical Review B - Condensed Matter and Materials Physics. 2008 ; Vol. 77, No. 5.
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    AU - Kim, J. H.

    AU - Lee, S. H.

    AU - Sato, T. J.

    AU - Suzuki, T.

    AU - Katsumura, M.

    AU - Katsufuji, Takuro

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