Er2Ti2O7: Evidence of quantum order by disorder in a frustrated antiferromagnet

J.D.M. Champion, M.J. Harris, P.C.W. Holdsworth, A.S. Wills, G. Balakrishnan, S.T. Bramwell, E. Cizmar, T. Fennell, J.S. Gardner, J. Lago, D.F. McMorrow, M. Orendac, A. Orendacova, D.M. Paul, R.I. Smith, M.T.F. Telling, A. Wildes

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Er(2)Ti(2)O(7) has been suggested to be a realization of the frustrated <111> XY pyrochlore lattice antiferromagnet, for which theory predicts fluctuation-induced symmetry breaking in a highly degenerate ground state manifold. We present a theoretical analysis of the classical model compared to neutron scattering experiments on the real material, both below and above T(N)=1.173(2) K. The model correctly predicts the ordered magnetic structure, suggesting that the real system has order stabilized by zero-point quantum fluctuations that can be modeled by classical spin wave theory. However, the model fails to describe the excitations of the system, which show unusual features.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume68
    Issue number2
    Pages (from-to)020401
    Number of pages4
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2003

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