Magnetization plateaux in dimerized spin ladder arrays

Details Magnetization plateaux in dimerized spin ladder arrays Magnetization plateaux in dimerized spin ladder arrays

1999-11-24

arxiv.org/abs/cond-mat/9911387v2

Phys. Rev. B 62, 337 (2000)

Physics

Condensed Matter

9 pages, RevTeX, 11 postscript figures

Scientific paper

10.1103/PhysRevB.62.337

We investigate the ground state magnetization plateaux appearing in spin 1/2 two-leg ladders built up from dimerized antiferromagnetic Heisenberg chains and dimerized zig-zag interchain couplings. Using both Abelian bosonization and Lanczos methods we find that the system yields rather unusual plateaux and exhibits massive and massless phases for specific choices or ``tuning'' of exchange interactions. The relevance of this behavior in the study of NH_4CuCl_3 is discussed.

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