Dynamical properties of S=1 bond-alternating Heisenberg chains at finite temperatures

Details Dynamical properties of S=1 bond-alternating Heisenberg chains at finite temperatures Dynamical properties of S=1 bond-alternating Heisenberg chains at finite temperatures

2005-05-31

arxiv.org/abs/cond-mat/0505735v3

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1016/j.physleta.2005.05.095

Dynamical structure factors of the S=1 bond-alternating spin chains in the dimer phase are calculated at finite temperature, using the pair dynamical correlated-effective-field approximation. At T=0, the delta-function-type peak of the one-magnon mode appears. When temperature is increased, such a sharp peak is broadened and the additional weak peak caused by the excitation from the triplet state to the quintet state emerges in the higher energy region. The results are discussed in comparison with those obtained by the exact diagonalization method.

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