Direct evidence for dominant bond-directional interactions in a
honeycomb lattice iridate Na2IrO3

J 2015

Direct evidence for dominant bond-directional interactions in a honeycomb lattice iridate Na2IrO3

CHUN, Sae Hwan, Jong-Woo KIM, Jungho KIM, H. ZHENG, Constantinos C STOUMPOS et. al.

Basic information

Original name

Direct evidence for dominant bond-directional interactions in a honeycomb lattice iridate Na2IrO3

Name in Czech

Přímý důkaz dominantních vazebně-směrových interakcí v iridátu Na2IrO3 s voštinovou mřížkou

Authors

CHUN, Sae Hwan (410 Republic of Korea), Jong-Woo KIM (410 Republic of Korea), Jungho KIM (410 Republic of Korea), H. ZHENG (156 China), Constantinos C STOUMPOS (840 United States of America), C.D. MALLIAKAS (840 United States of America), J.F. MITCHELL (840 United States of America), Kavita MEHLAWAT (356 India), Yogesh SINGH (356 India), Y. CHOI (410 Republic of Korea), T. GOG (840 United States of America), A. AL-ZEIN (250 France), M. Moretti SALA (380 Italy), M. KRISCH (276 Germany), Jiří CHALOUPKA (203 Czech Republic, guarantor, belonging to the institution), George JACKELI (268 Georgia), Giniyat KHALIULLIN (643 Russian Federation) and B.J. KIM (410 Republic of Korea)

Edition

Nature Physics, London, Nature Publishing Group, 2015, 1745-2473

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10302 Condensed matter physics

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 18.791

RIV identification code

RIV/00216224:14740/15:00086048

Organization unit

Central European Institute of Technology

DOI

http://dx.doi.org/10.1038/NPHYS3322

UT WoS

000355552200010

Keywords (in Czech)

spinové interakce; frustrovaný magnetismus; iridáty; spinové modely

Keywords in English

spin interactions; frustrated magnetism; iridates; spin models

Abstract

V originále

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.

Links

ED1.1.00/02.0068, research and development project

Name: CEITEC - central european institute of technology

286154, interní kód MU

Name: SYLICA - Synergies of Life and Material Sciences to Create a New Future (Acronym: SYLICA)

Investor: European Union, Capacities

Citovat

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 and B.J. KIM. Direct evidence for dominant bond-directional interactions in a honeycomb lattice iridate Na2IrO3. Nature Physics. London: Nature Publishing Group, 2015, vol. 11, No 6, p. 462-467. ISSN 1745-2473. Available from: https://dx.doi.org/10.1038/NPHYS3322.

@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 and B.J. KIM. Direct evidence for dominant bond-directional interactions in a honeycomb lattice iridate Na2IrO3. \textit{Nature Physics}. London: Nature Publishing Group, 2015, vol.~11, No~6, p.~462-467. ISSN~1745-2473. Available from: https://dx.doi.org/10.1038/NPHYS3322.

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