Alternating spin chains with singlet ground states

Details Alternating spin chains with singlet ground states Alternating spin chains with singlet ground states

1997-07-15

arxiv.org/abs/cond-mat/9707148v1

Physics

Condensed Matter

Statistical Mechanics

9 pages, revtex, to appear in PRB

Scientific paper

10.1103/PhysRevB.56.8799

We investigate low-energy properties of the alternating spin chain model composed of spin $s_1$ and $s_2$ with a singlet ground state. After examining the spin-wave spectrum in detail, we map low-energy spin excitations to the O(3) non-linear sigma model in order to take into account quantum fluctuations. Analyzing the topological term in the resulting sigma model, we discuss how the massless or massive excitations are developed, especially according to the topological nature of the alternating spin system.

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