Quantum features in the spin dynamics of S=1/2 and 1 Heisenberg antiferromagnets in spite of long-range ordered phases

M. Enderle, K. Kiefer, A. Klopperpieper, J. Albers, G.J. McIntyre, K. Lefmann, W. Schmidt, R. van de Kamp

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Uniform S = 1 and 1/2 Heisenberg antiferromagnetic chains have a quantum singlet ground state which is an eigenstate of the total spin with S(tot) = 0. However, the 'internal' order of these ground states is quite different, and is reflected in gapless excitations in the S = 1/2 state, while the S = 1 chain has a triplet excitation gap known as the Haldane gap. The exchange interactions of the antiferromagnets CsNiCl(3) (S = 1) and Cu-tetraminsulfate (S = 1/2) are quasi-one dimensional, leading to long-range ordered Neel ground states. Nevertheless, we find evidence of quantum spin dynamics. (C) 2000 Elsevier Science B.V. All rights reserved.
    Original languageEnglish
    JournalPhysica B: Condensed Matter
    Volume276-278
    Pages (from-to)782-783
    ISSN0921-4526
    DOIs
    Publication statusPublished - 2000

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