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Dzyaloshinskii-Moriya anisotropy and nonmagnetic impurities in the s= 1/2 kagome system ZnCu3 (OH) 6 Cl2

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posted on 09.08.2018, 08:49 by Ioannis Rousochatzakis, Salvatore R. Manmana, Andreas M. Lauchli, Bruce Normand, Frederic Mila
Motivated by recent nuclear magnetic resonance experiments on ZnCu3 (OH) 6 Cl2, we present an exact-diagonalization study of the combined effects of nonmagnetic impurities and Dzyaloshinskii-Moriya (DM) interactions in the s=1/2 kagome antiferromagnet. The local response to an applied field and correlation-matrix data reveal that the dimer freezing which occurs around each impurity for D=0 persists at least up to D/J sqar;0.06, where J and D denote, respectively, the exchange and DM interaction energies. The phase transition to the (Q=0) semiclassical 120°state favored at large D takes place at D/Jsqar;0.1. However, the dimers next to the impurity sites remain strong up to values D∼J, far above this critical point, and thus do not participate fully in the ordered state. We discuss the implications of our results for experiments on ZnCu3 (OH) 6 Cl2. © 2009 The American Physical Society.

Funding

This work was supported by the Swiss National Science Foundation and by MaNEP.

History

School

  • Science

Department

  • Physics

Published in

Physical Review B - Condensed Matter and Materials Physics

Volume

79

Issue

21

Citation

ROUSOCHATZAKIS, I. ... et al., 2009. Dzyaloshinskii-Moriya anisotropy and nonmagnetic impurities in the s= 1/2 kagome system ZnCu3 (OH) 6 Cl2. Physical Review B - Condensed Matter and Materials Physics, 79: 214415.

Publisher

© American Physical Society (APS)

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2009

Notes

This paper was accepted for publication in the journal Physical Review B - Condensed Matter and Materials Physics and the definitive published version is available at https://doi.org/10.1103/PhysRevB.79.214415

ISSN

1098-0121

eISSN

1550-235X

Language

en

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