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@article{1331271,
author = {Chun, Sae Hwan and Kim, JongandWoo and Kim, Jungho and Zheng, H. and Stoumpos, Constantinos C and Malliakas, C.D. and Mitchell, J.F. and Mehlawat, Kavita and Singh, Yogesh and Choi, Y. and Gog, T. and AlandZein, A. and Sala, M. Moretti and Krisch, M. and Chaloupka, Jiří and Jackeli, George and Khaliullin, Giniyat and Kim, B.J.},
article_location = {London},
article_number = {6},
doi = {http://dx.doi.org/10.1038/NPHYS3322},
keywords = {spin interactions; frustrated magnetism; iridates; spin models},
language = {eng},
issn = {1745-2473},
journal = {Nature Physics},
title = {Direct evidence for dominant bond-directional interactions in a honeycomb lattice iridate Na2IrO3},
url = {http://www.nature.com/nphys/journal/v11/n6/full/nphys3322.html},
volume = {11},
year = {2015}
}
TY - JOUR
ID - 1331271
AU - Chun, Sae Hwan - Kim, Jong-Woo - Kim, Jungho - Zheng, H. - Stoumpos, Constantinos C - Malliakas, C.D. - Mitchell, J.F. - Mehlawat, Kavita - Singh, Yogesh - Choi, Y. - Gog, T. - Al-Zein, A. - Sala, M. Moretti - Krisch, M. - Chaloupka, Jiří - Jackeli, George - Khaliullin, Giniyat - Kim, B.J.
PY - 2015
TI - Direct evidence for dominant bond-directional interactions in a honeycomb lattice iridate Na2IrO3
JF - Nature Physics
VL - 11
IS - 6
SP - 462-467
EP - 462-467
PB - Nature Publishing Group
SN - 17452473
KW - spin interactions
KW - frustrated magnetism
KW - iridates
KW - spin models
UR - http://www.nature.com/nphys/journal/v11/n6/full/nphys3322.html
L2 - http://www.nature.com/nphys/journal/v11/n6/full/nphys3322.html
N2 - Heisenberg interactions are ubiquitous in magnetic materials and play a central role in modelling and designing quantum magnets. Bond-directional interactions offer a novel alternative to Heisenberg exchange and provide the building blocks of the Kitaev model, which has a quantum spin liquid as its exact ground state. Honeycomb iridates, A2IrO3 (A = Na, Li), offer potential realizations of the Kitaev magnetic exchange coupling, and their reported magnetic behaviour may be interpreted within the Kitaev framework. However, the extent of their relevance to the Kitaev model remains unclear, as evidence for bond-directional interactions has so far been indirect. Herewe present direct evidence for dominant bond-directional interactions in antiferromagnetic Na2IrO3 and show that they lead to strong magnetic frustration. Diffuse magnetic X-ray scattering reveals broken spin-rotational symmetry even above the Neel temperature, with the three spin components exhibiting short-range correlations along distinct crystallographic directions. This spin- and real-space entanglement directly uncovers the bond-directional nature of these interactions, thus providing a direct connection between honeycomb iridates and Kitaev physics.
ER -
CHUN, Sae Hwan, Jong-Woo KIM, Jungho KIM, H. ZHENG, Constantinos C STOUMPOS, C.D. MALLIAKAS, J.F. MITCHELL, Kavita MEHLAWAT, Yogesh SINGH, Y. CHOI, T. GOG, A. AL-ZEIN, M. Moretti SALA, M. KRISCH, Jiří CHALOUPKA, George JACKELI, Giniyat KHALIULLIN a B.J. KIM. Direct evidence for dominant bond-directional interactions in a honeycomb lattice iridate Na2IrO3. \textit{Nature Physics}. London: Nature Publishing Group, roč.~11, č.~6, s.~462-467. ISSN~1745-2473. doi:10.1038/NPHYS3322. 2015.
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