Spin Chains with Periodic Array of Impurities

Details Spin Chains with Periodic Array of Impurities Spin Chains with Periodic Array of Impurities

1997-04-09

arxiv.org/abs/cond-mat/9704072v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, revtex, To appear in PRB

Scientific paper

10.1103/PhysRevB.55.R14709

We investigate the spin chain model composed of periodic array of two kinds of spins $S_1$ and $S_2$, which allows us to study the spin chains with impurities as well as the alternating spin chains in a unified fashion. By using the Lieb-Shultz-Mattis theorem, we first study the model rigorously, and then by mapping it to the non-linear sigma model, we extensively investigate low-energy properties with particular emphasis on the competition between the massive and massless phases.

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