Shared more. Cited more. Safe forever.
    • advanced search
    • submit works
    • about
    • help
    • contact us
    • login
    View Item 
    •   MOspace Home
    • University of Missouri-Columbia
    • College of Arts and Sciences (MU)
    • Department of Physics and Astronomy (MU)
    • Physics and Astronomy publications (MU)
    • View Item
    •   MOspace Home
    • University of Missouri-Columbia
    • College of Arts and Sciences (MU)
    • Department of Physics and Astronomy (MU)
    • Physics and Astronomy publications (MU)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.
    advanced searchsubmit worksabouthelpcontact us

    Browse

    All of MOspaceCommunities & CollectionsDate IssuedAuthor/ContributorTitleIdentifierThesis DepartmentThesis AdvisorThesis SemesterThis CollectionDate IssuedAuthor/ContributorTitleIdentifierThesis DepartmentThesis AdvisorThesis Semester

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular AuthorsStatistics by Referrer

    Orbital ordering and exchange interaction in the manganites

    Meskine, Hakim, 1972-
    König, Harald
    Satpathy, Sashi Sekhar, 1956-
    View/Open
    [PDF] Article (448.5Kb)
    Date
    2001
    Format
    Article
    Metadata
    [+] Show full item record
    Abstract
    The microscopic origin of the exchange interaction in manganites is studied by solving an electronic model Hamiltonian for the Mn-O-Mn triad. It is shown that the magnetic structure of La1-xCaxMnO3 is correctly described within an electronic Hamiltonian model, provided that the appropriate orientation of the Mn(eg) orbitals induced by the Jahn-Teller effect is taken into account. The Jahn-Teller distortions of the MnO6 octahedra control the orientation of the eg orbitals in the crystal, which in turn is shown to determine the sign of the magnetic exchange. Electron hopping involving the Mn(t2g) orbitals is found to be important in certain situations, for instance, it can cause a sign change in the exchange interaction, from ferromagnetic to antiferromagnetic, as a function of the Mn-O-Mn bond angle. All our results are obtained by exact diagonalization of the model Hamiltonian, either by direct diagonalization or by diagonalization using the Lanczos method, if the Hamiltonian is too big, and are rationalized using results of the fourth-order perturbation theory. The exchange interactions (signs and magnitudes) of the end members LaMnO3 and CaMnO3 as well as of the half-doped compound, La1/2Ca1/2MnO3, are all described correctly within the model.
    URI
    http://hdl.handle.net/10355/9317
    Citation
    Phys. Rev. B 64, 094433 (2001) [13 pages]
    Collections
    • Physics and Astronomy publications (MU)

    Send Feedback
    hosted by University of Missouri Library Systems
     

     


    Send Feedback
    hosted by University of Missouri Library Systems