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    antiferromagnetic Heisenberg spin chain (1)
    antiferromagnetic materials (1)
    exchange constant (1)
    gapless continuum (1)
    Heisenberg model (1)
    lower boundary (1)
    magnetic excitations (1)
    neutron scattering (1)
    spin dynamics (1)
    spinons (1)
    SrCuO2 (1)
    strongly correlated copper oxide chains (1)
    strongly correlated electron systems; (1)
    strontium compounds (1)
    two-spinon continuum (1)