Neutron scattering study of two-magnon states in the quantum magnet copper nitrate

D.A. Tennant, C. Broholm, D.H. Reich, S.E. Nagler, G.E. Granroth, T. Barnes, K. Damle, G. Xu, Y. Chen, B.C. Sales

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We report measurements of the two-magnon states in a dimerized antiferromagnetic chain material, copper nitrate [Cu(NO3)(2).2.5D(2)O]. Using inelastic neutron scattering we have measured the one- and two-magnon excitation spectra in a large single crystal. The data are in excellent agreement with a perturbative expansion of the alternating Heisenberg Hamiltonian from the strongly dimerized limit. The expansion predicts a two-magnon bound state for qsimilar to(2n+1)pid which is consistent with the neutron scattering data.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume67
    Issue number5
    Pages (from-to)054414
    Number of pages11
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2003

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