Phys. Rev. B 72, 012416 (2005) [4 pages]Two-magnon Raman scattering in spin ladders with exact singlet-rung ground stateReceived 24 February 2005; revised 25 April 2005; published 22 July 2005 Using coordinate Bethe ansatze we construct two-magnon states for the family of spin-ladder models with exact singlet-rung vacuum suggested by A. K. Kolezhuk and H.-J. Mikeska. The explicit formula for the zero-temperature Raman scattering cross section is derived. The corresponding line shapes are strongly asymmetric and their singularities originate only from bound states. This form of a line shape is in good correspondence to the experimental data. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.012416
DOI:
10.1103/PhysRevB.72.012416
PACS:
75.10.Jm, 78.30.−j, 72.25.Rb
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