Phys. Rev. B 62, 337–343 (2000)Magnetization plateaus in dimerized spin-ladder arraysReceived 23 November 1999; revised 24 February 2000; published in the issue dated 1 July 2000 We investigate the ground-state magnetization plateaus 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 plateaus and exhibits massive and massless phases for specific choices or “tuning” of exchange interactions. The relevance of this behavior in the study of NH4CuCl3 is discussed. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.62.337
DOI:
10.1103/PhysRevB.62.337
PACS:
75.10.Jm, 75.60.Ej
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