Schwinger-boson approach to the kagome antiferromagnet with Dzyaloshinskii-Moriya interactions: Phase diagram and dynamical structure factors

L. Messio, O. Cépas, and C. Lhuillier
Phys. Rev. B 81, 064428 – Published 24 February 2010

Abstract

We have obtained the zero-temperature phase diagram of the kagomé antiferromagnet with Dzyaloshinskii-Moriya interactions in Schwinger-boson mean-field theory. We find quantum phase transitions (first or second order) between different topological spin-liquid and Néel-ordered phases (either the 3×3 state or the so-called Q=0 state). In the regime of small Schwinger-boson density, the results bear some resemblances with exact diagonalization results and we briefly discuss some issues of the mean-field treatment. We calculate the equal-time structure factor (and its angular average to allow for a direct comparison with experiments on powder samples), which extends earlier work on the classical kagomé to the quantum regime. We also discuss the dynamical structure factors of the topological spin-liquid and the Néel-ordered phases.

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  • Received 14 December 2009

DOI:https://doi.org/10.1103/PhysRevB.81.064428

©2010 American Physical Society

Authors & Affiliations

L. Messio1, O. Cépas2, and C. Lhuillier1

  • 1Laboratoire de physique théorique de la matière condensée, UMR 7600 CNRS, Université Pierre-et-Marie-Curie-Paris 6, 75252 Paris Cedex 05, France
  • 2Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France

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Vol. 81, Iss. 6 — 1 February 2010

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