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Magnetization plateaux in dimerized spin ladder arrays

D. C. Cabra·M. D. Grynberg
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Abstract

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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D. C. Cabra, M. D. Grynberg. 2000-07-07. Magnetization plateaux in dimerized spin ladder arrays. https://doi.org/10.1103/physrevb.62.337

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