Phys. Rev. Lett. 83, 1668–1671 (1999)Dynamics of the S = 1/2 Alternating Chains at T = ∞Received 28 December 1998; published in the issue dated 23 August 1999 The well-defined delocalization modes of JAF and 2JAF, where JAF is the antiferromagnetic exchange integral in a spin pair, are obtained in the S = 1/2 alternating chains for (α/JAF)2≪1 at T = ∞ in terms of the continued fraction formalism with the recurrence relations method. These modes correspond to the single and the double singlet-to-triplet local excitations, respectively. Dynamically these very short-ranged and very weak correlations survive at T = ∞. We raise the possibility of observing these modes in neutron and Raman scattering at high temperatures, kBT≫JAF. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.1668
DOI:
10.1103/PhysRevLett.83.1668
PACS:
75.10.Jm, 05.70.Ln, 75.40.Gb
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