Probing spin frustration in high-symmetry magnetic nanomolecules by inelastic neutron scattering

V.O. Garlea, S.E. Nagler, J.L. Zarestky, C. Strassis, D. Vaknin, P. Kogerler, D.F. McMorrow, C. Niedermayer, D.A. Tennant, B. Lake, Y. Qiu, M. Exler, J. Schnack, M. Luban

    Research output: Contribution to journalJournal articlepeer-review

    Abstract

    Low temperature inelastic neutron scattering studies have been performed to characterize the low energy magnetic excitation spectrum of the magnetic nanomolecule {Mo(72)Fe(30)}. This unique highly symmetric cluster features spin frustration and is one of the largest discrete magnetic molecules studied to date by inelastic neutron scattering. The 30 s=5/2 Fe(III) ions, embedded in a spherical polyoxomolybdate molecule, occupy the vertices of an icosidodecahedron and are coupled via nearest-neighbor antiferromagnetic interactions. The overall energy scale of the excitation and the gross features of the temperature dependence of the observed neutron scattering are explained by a quantum model of the frustrated spin cluster. However, no satisfactory theoretical explanation is yet available for the observed magnetic field dependence.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume73
    Issue number2
    Pages (from-to)024414
    Number of pages5
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2006

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