Combined analytical and numerical approach to study magnetization plateaux in doped quasi-one-dimensional antiferromagnets

C. A. Lamas, S. Capponi, and P. Pujol
Phys. Rev. B 84, 115125 – Published 21 September 2011

Abstract

We investigate the magnetic properties of quasi-one-dimensional quantum spin-S antiferromagnets. We use a combination of analytical and numerical techniques to study the presence of plateaux in the magnetization curve. The analytical technique consists in a path integral formulation in terms of coherent states. This technique can be extended to the presence of doping and has the advantage of a much better control for large spins than the usual bosonization technique. We discuss the appearance of doping-dependent plateaux in the magnetization curves for spin-S chains and ladders. The analytical results are complemented by a density matrix renormalization group (DMRG) study for a trimerized spin-1/2 and anisotropic spin-3/2 doped chains.

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  • Received 23 May 2011

DOI:https://doi.org/10.1103/PhysRevB.84.115125

©2011 American Physical Society

Authors & Affiliations

C. A. Lamas, S. Capponi, and P. Pujol

  • Laboratoire de Physique Théorique, IRSAMC, CNRS and Université de Toulouse, UPS, FR-31062 Toulouse, France

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Issue

Vol. 84, Iss. 11 — 15 September 2011

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