Phys. Rev. B 48, 3281–3286 (1993)Dynamical properties of antiferromagnetic Heisenberg spin chainsReceived 22 January 1993; published in the issue dated 1 August 1993 The dynamical properties of spin-1 and spin-1/2 antiferromagnetic Heisenberg chains (AHC’s) are studied by diagonalizing exactly clusters of up to 18 and 26 sites, respectively. It is shown that the spin-1 AHC has a quasi-single-mode spectrum for momentum k≥0.3π, while the low-energy edge of the spin-1/2 AHC is dominated by a spin-wave continuum. The dispersion curve obtained for the spin-1 chain is in excellent agreement with recent experiments on Ni(C2H8N2)2NO2ClO4. The size dependence of the low-energy spectral weights is also analyzed. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.48.3281
DOI:
10.1103/PhysRevB.48.3281
PACS:
75.10.Jm, 75.40.Gb, 75.40.Mg, 75.50.Ee
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