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Strongly frustrated triangular spin lattice emerging from triplet dimer formation in honeycomb Li2IrO3

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posted on 06.08.2018 by Satoshi Nishimoto, Vamshi M. Katukuri, Viktor Yushankhai, Hermann Stoll, Ulrich K. Roessler, Liviu Hozoi, Ioannis Rousochatzakis, Jeroen van den Brink
Iridium oxides with a honeycomb lattice have been identified as platforms for the much anticipated Kitaev topological spin liquid: the spin-orbit entangled states of Ir4+in principle generate precisely the required type of anisotropic exchange. However, other magnetic couplings can drive the system away from the spin-liquid phase. With this in mind, here we disentangle the different magnetic interactions in Li2IrO3, a honeycomb iridate with two crystallographically inequivalent sets of adjacent Ir sites. Our ab initio many-body calculations show that, while both Heisenberg and Kitaev nearest-neighbour couplings are present, on one set of Ir-Ir bonds the former dominates, resulting in the formation of spin-triplet dimers. The triplet dimers frame a strongly frustrated triangular lattice and by exact cluster diagonalization we show that they remain protected in a wide region of the phase diagram.

Funding

Partial financial support from the German Research Foundation (HO-4427 and SFB 1143) is gratefully acknowledged.

History

School

  • Science

Department

  • Physics

Published in

Nature Communications

Volume

7

Citation

NISHIMOTO, S. ... et al, 2016. Strongly frustrated triangular spin lattice emerging from triplet dimer formation in honeycomb Li2IrO3. Nature Communications, 7, Article number 10273.

Publisher

Nature Publishing Group

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

24/11/2015

Publication date

2016-01-18

Notes

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

ISSN

2041-1723

eISSN

2041-1723

Language

en

Article number

10273

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