Phonon-induced quadrupolar ordering of the magnetic superconductor TmNi2B2C

N.H. Andersen, J. Jensen, T.B.S. Jensen, M.V. Zimmermann, R. Pinholt, A.B. Abrahamsen, K.N. Toft, P. Hedegaard, P.C. Canfield

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    Abstract

    We present synchrotron x-ray diffraction studies revealing that the lattice of thulium borocarbide is distorted below T(Q)similar or equal to 13.5 K at zero field. T-Q increases and the amplitude of the displacements is drastically enhanced by a factor of 10 at 60 kOe when a magnetic field is applied along [100]. The distortion occurs at the same wave vector as the antiferromagnetic ordering induced by the a-axis field. A model is presented that accounts for the properties of the quadrupolar phase and explains the peculiar behavior of the antiferromagnetic ordering previously observed in this compound.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume73
    Issue number2
    Pages (from-to)020504
    Number of pages4
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2006

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