Field-induced magnetic phases and electric polarization in LiNiPO4

Thomas Bagger Stibius Jensen, Niels Bech Christensen, M. Kenzelmann, H.M. Ronnow, C. Niedermayer, Niels Hessel Andersen, Kim Lefmann, J. Schefer, M. Von Zimmermann, J. Li, J.L. Zarestky, D. Vaknin

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    Abstract

    Neutron diffraction is used to probe the (H,T) phase diagram of magnetoelectric (ME) LiNiPO4 for magnetic fields along the c axis. At zero field the Ni spins order in two antiferromagnetic phases. One has commensurate (C) structures and general ordering vectors k(C)=(0,0,0); the other one is incommensurate (IC) with k(IC)=(0,q,0). At low temperatures the C order collapses above mu H-0=12 T and adopts an IC structure with modulation vector parallel to k(IC). We show that C order is required for the ME effect and establish how electric polarization results from a field-induced reduction in the total magnetoelastic energy.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume79
    Issue number9
    Pages (from-to)092412
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2009

    Bibliographical note

    Copyright 2009 American Physical Society

    Keywords

    • Materials characterization and modelling
    • Materials research
    • magnetic structure
    • nickel compounds
    • lithium compounds
    • magnetoelectric effects
    • antiferromagnetism
    • neutron diffraction
    • magnetoelastic effects
    • magnetic transitions

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