Extended quantum critical phase in a magnetized spin-1/2 antiferromagnetic chain

M.B. Stone, D.H. Reich, C. Broholm, K. Lefmann, C. Rischel, C.P. Landee, M.M. Turnbull

    Research output: Contribution to journalJournal articleResearchpeer-review


    Measurements are reported of the magnetic field dependence of excitations in the quantum critical state of the spin S=1/2 linear chain Heisenberg antiferromagnet copper pyrazine dinitrate (CuPzN). The complete spectrum was measured at k(B)T/Jless than or equal to0.025 for H=0 and H=8.7 T, where the system is similar to30% magnetized. At H=0, the results are in agreement with exact calculations of the dynamic spin correlation function for a two-spinon continuum. At H=8.7 T, there are multiple overlapping continua with incommensurate soft modes. The boundaries of these continua confirm long-standing predictions, and the intensities are consistent with exact diagonalization and Bethe ansatz calculations.
    Original languageEnglish
    JournalPhysical Review Letters
    Issue number3
    Pages (from-to)037205
    Number of pages4
    Publication statusPublished - 2003


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