Dynamic Spin Correlations in the Honeycomb Lattice Na2IrO3
Measured by Resonant Inelastic x-Ray Scattering

J 2020

Dynamic Spin Correlations in the Honeycomb Lattice Na2IrO3 Measured by Resonant Inelastic x-Ray Scattering

KIM, Jungho, Jiří CHALOUPKA, Yogesh SINGH, J. W. KIM, B. J. KIM et. al.

Základní údaje

Originální název

Dynamic Spin Correlations in the Honeycomb Lattice Na2IrO3 Measured by Resonant Inelastic x-Ray Scattering

Autoři

KIM, Jungho (garant), Jiří CHALOUPKA (203 Česká republika, domácí), Yogesh SINGH, J. W. KIM, B. J. KIM, D. CASA, A. SAID, X. HUANG a T. GOG

Vydání

Physical Review X, College Park, American Physical Society, 2020, 2160-3308

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10302 Condensed matter physics

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 15.762

Kód RIV

RIV/00216224:14310/20:00114457

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1103/PhysRevX.10.021034

UT WoS

000532127800001

Klíčová slova anglicky

Antiferromagnetism; Spin dynamics; Exact diagonalization

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 12. 11. 2020 16:05, Mgr. Marie Šípková, DiS.

Anotace

V originále

A Kitaev quantum spin liquid is a prime example of novel quantum magnetism of spin-orbit entangled pseudospin-1/2 moments in a honeycomb lattice. Most candidate materials such as Na2IrO3 have many competing exchange interactions beyond the minimal Kitaev-Heisenberg model whose small variations in the strength of the interactions produce huge differences in low-energy dynamics. Our incomplete knowledge of dynamic spin correlations hampers identification of a minimal model and quantification of the proximity to the Kitaev quantum spin-liquid phase. Here, we report momentum- and energy-resolved magnetic excitation spectra in a honeycomb lattice Na2IrO3 measured using a resonant inelastic x-ray scattering spectrometer capable of 12 meV resolution. Measured spectra at a low temperature show that the dynamic response lacks resolution-limited coherent spin waves in most parts of the Brillouin zone but has a discernible dispersion and spectral weight distribution within the energy window of 60 meV. A systematic investigation using the exact diagonalization method and direct comparison of high-resolution experimental spectra and theoretical simulations allow us to confine a parameter regime in which the extended Kitaev-Heisenberg model reasonably reproduces the main feature of the observed magnetic excitations. Hidden Kitaev quantum spin-liquid and Heisenberg phases found in the complex parameter space are used as references to propose the picture of renormalized magnons as explaining the incoherent nature of magnetic excitations. Magnetic excitation spectra are taken at elevated temperatures to follow the temperature evolution of the resonant inelastic x-ray scattering dynamic response in the paramagnetic state. Whereas the low-energy excitation progressively diminishes as the zigzag order disappears, the broad high-energy excitation maintains its spectral weight up to a much higher temperature of 160 K. We suggest that the dominant nearest-neighbor interactions keep short-range correlations up to quite high temperatures with a specific short-range dynamics which has a possible connection to a proximate spinliquid phase.

Návaznosti

GA19-16937S, projekt VaV

Název: Frustrované a nefrustrované spinové systémy s měkkými spiny v relativistických Mottových izolantech

Investor: Grantová agentura ČR, Frustrované a nefrustrované spinové systémy s měkkými spiny v relativistických Mottových izolantech

LM2015085, projekt VaV

Název: CERIT Scientific Cloud (Akronym: CERIT-SC)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, CERIT Scientific Cloud

LQ1601, projekt VaV

Název: CEITEC 2020 (Akronym: CEITEC2020)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, CEITEC 2020

Citovat

KIM, Jungho, Jiří CHALOUPKA, Yogesh SINGH, J. W. KIM, B. J. KIM, D. CASA, A. SAID, X. HUANG a T. GOG. Dynamic Spin Correlations in the Honeycomb Lattice Na2IrO3 Measured by Resonant Inelastic x-Ray Scattering. Physical Review X. College Park: American Physical Society, 2020, roč. 10, č. 2, s. 1-20. ISSN 2160-3308. Dostupné z: https://dx.doi.org/10.1103/PhysRevX.10.021034.

@article{1693001,
   author = {Kim, Jungho and Chaloupka, Jiří and Singh, Yogesh and Kim, J. W. and Kim, B. J. and Casa, D. and Said, A. and Huang, X. and Gog, T.},
   article_location = {College Park},
   article_number = {2},
   doi = {http://dx.doi.org/10.1103/PhysRevX.10.021034},
   keywords = {Antiferromagnetism; Spin dynamics; Exact diagonalization},
   language = {eng},
   issn = {2160-3308},
   journal = {Physical Review X},
   title = {Dynamic Spin Correlations in the Honeycomb Lattice Na2IrO3 Measured by Resonant Inelastic x-Ray Scattering},
   url = {https://journals.aps.org/prx/abstract/10.1103/PhysRevX.10.021034},
   volume = {10},
   year = {2020}
}

TY  - JOUR
ID  - 1693001
AU  - Kim, Jungho - Chaloupka, Jiří - Singh, Yogesh - Kim, J. W. - Kim, B. J. - Casa, D. - Said, A. - Huang, X. - Gog, T.
PY  - 2020
TI  - Dynamic Spin Correlations in the Honeycomb Lattice Na2IrO3 Measured by Resonant Inelastic x-Ray Scattering
JF  - Physical Review X
VL  - 10
IS  - 2
SP  - 1-20
EP  - 1-20
PB  - American Physical Society
SN  - 21603308
KW  - Antiferromagnetism
KW  - Spin dynamics
KW  - Exact diagonalization
UR  - https://journals.aps.org/prx/abstract/10.1103/PhysRevX.10.021034
L2  - https://journals.aps.org/prx/abstract/10.1103/PhysRevX.10.021034
N2  - A Kitaev quantum spin liquid is a prime example of novel quantum magnetism of spin-orbit entangled pseudospin-1/2 moments in a honeycomb lattice. Most candidate materials such as Na2IrO3 have many competing exchange interactions beyond the minimal Kitaev-Heisenberg model whose small variations in the strength of the interactions produce huge differences in low-energy dynamics. Our incomplete knowledge of dynamic spin correlations hampers identification of a minimal model and quantification of the proximity to the Kitaev quantum spin-liquid phase. Here, we report momentum- and energy-resolved magnetic excitation spectra in a honeycomb lattice Na2IrO3 measured using a resonant inelastic x-ray scattering spectrometer capable of 12 meV resolution. Measured spectra at a low temperature show that the dynamic response lacks resolution-limited coherent spin waves in most parts of the Brillouin zone but has a discernible dispersion and spectral weight distribution within the energy window of 60 meV. A systematic investigation using the exact diagonalization method and direct comparison of high-resolution experimental spectra and theoretical simulations allow us to confine a parameter regime in which the extended Kitaev-Heisenberg model reasonably reproduces the main feature of the observed magnetic excitations. Hidden Kitaev quantum spin-liquid and Heisenberg phases found in the complex parameter space are used as references to propose the picture of renormalized magnons as explaining the incoherent nature of magnetic excitations. Magnetic excitation spectra are taken at elevated temperatures to follow the temperature evolution of the resonant inelastic x-ray scattering dynamic response in the paramagnetic state. Whereas the low-energy excitation progressively diminishes as the zigzag order disappears, the broad high-energy excitation maintains its spectral weight up to a much higher temperature of 160 K. We suggest that the dominant nearest-neighbor interactions keep short-range correlations up to quite high temperatures with a specific short-range dynamics which has a possible connection to a proximate spinliquid phase.
ER  -

KIM, Jungho, Jiří CHALOUPKA, Yogesh SINGH, J. W. KIM, B. J. KIM, D. CASA, A. SAID, X. HUANG a T. GOG. Dynamic Spin Correlations in the Honeycomb Lattice Na2IrO3 Measured by Resonant Inelastic x-Ray Scattering. \textit{Physical Review X}. College Park: American Physical Society, 2020, roč.~10, č.~2, s.~1-20. ISSN~2160-3308. Dostupné z: https://dx.doi.org/10.1103/PhysRevX.10.021034.

Podrobný výpis o publikaci