Anomalous spin waves and the commensurate-incommensurate magnetic phase transition in LiNiPO4

Thomas Bagger Stibius Jensen, Niels Bech Christensen, M. Kenzelmann, H.M. Ronnow, C. Niedermayer, Niels Hessel Andersen, Kim Lefmann, M. Jimenez-Ruiz, F. Demmel, J. Li, J.L. Zarestky, D. Vaknin

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    Abstract

    Detailed spin-wave spectra of magnetoelectric LiNiPO4 have been measured by neutron scattering at low temperatures in the commensurate (C) antiferromagnetic (AF) phase below T-N=20.8 K. An anomalous shallow minimum is observed at the modulation vector of the incommensurate (IC) AF phase appearing above T-N. A linear spin-wave model based on Heisenberg exchange couplings and single-ion anisotropies accounts for all the observed spin-wave dispersions and intensities. Along the b axis an unusually strong next-nearest-neighbor AF coupling competes with the dominant nearest-neighbor AF exchange interaction and causes the IC structure.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume79
    Issue number9
    Pages (from-to)092413
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2009

    Bibliographical note

    Copyright 2009 American Physical Society

    Keywords

    • commensurate-incommensurate transformations
    • magnetoelectric effects
    • exchange interactions (electron)
    • Materials research
    • Materials characterization and modelling
    • Heisenberg model
    • nickel compounds
    • lithium compounds
    • magnetic anisotropy
    • neutron diffraction
    • antiferromagnetic materials
    • magnetic transitions
    • spin waves

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