Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters

K. Prsa, H.M. Rønnow, O. Zaharko, Niels Bech Christensen, J. Jensen, J. Chang, S. Streule, M. Jimenez-Ruiz, H. Berger, M. Prester, J. Mesot

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    Abstract

    An inelastic neutron scattering study of Cu2Te2O5X2 (X=Cl, Br) shows strong dispersive modes with large energy gaps persisting far above T-N, notably in Cu2Te2O5Br2. The anomalous features: a coexisting unusually weak Goldstone-like mode observed in Cu2Te2O5Cl2 and the size of the energy gaps cannot be explained by existing theories, such as our mean-field or random-phase approximation. We argue that our findings represent a new general type of behavior due to intercluster quantum fluctuations and call for development of a new theoretical approach.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume102
    Issue number17
    Pages (from-to)177202
    ISSN0031-9007
    DOIs
    Publication statusPublished - 2009

    Bibliographical note

    Copyright (2009) by the American Physical Society.

    Keywords

    • Materials characterization and modelling
    • Materials research

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