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Valence bond liquid phase in the honeycomb lattice material Li2RuO3

Kimber, Simon A. J.; Mazin, I. I.; Shen, Juan; Jeschke, Harald O.; Streltsov, Sergey V.; Argyriou, Dimitri LU ; Valenti, Roser and Khomskii, Daniel I. (2014) In Physical Review B (Condensed Matter and Materials Physics) 89(8).
Abstract
The honeycomb lattice material Li2RuO3 undergoes a dimerization of Ru4+ cations on cooling below 270 degrees C, where the magnetic susceptibility vanishes. We use density functional theory calculations to show that this reflects the formation of a valence bond crystal, with a strong structural bond disproportionation. On warming, x-ray diffraction shows that discrete threefold symmetry is regained on average, and the dimerization apparently disappears. In contrast, local structural measurements using high-energy x rays show that disordered dimers survive at the nanoscale up to at least 650 degrees C. The high-temperature phase of Li2RuO3 is thus an example of a valence bond liquid, where thermal fluctuations drive resonance between... (More)
The honeycomb lattice material Li2RuO3 undergoes a dimerization of Ru4+ cations on cooling below 270 degrees C, where the magnetic susceptibility vanishes. We use density functional theory calculations to show that this reflects the formation of a valence bond crystal, with a strong structural bond disproportionation. On warming, x-ray diffraction shows that discrete threefold symmetry is regained on average, and the dimerization apparently disappears. In contrast, local structural measurements using high-energy x rays show that disordered dimers survive at the nanoscale up to at least 650 degrees C. The high-temperature phase of Li2RuO3 is thus an example of a valence bond liquid, where thermal fluctuations drive resonance between different dimer coverages, a classic analog of the resonating valence bond state often discussed in connection with high-T-c cuprates. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
89
issue
8
publisher
American Physical Society
external identifiers
  • wos:000332420500001
  • scopus:84897677581
ISSN
1098-0121
DOI
10.1103/PhysRevB.89.081408
language
English
LU publication?
yes
id
2383d1c1-c446-4842-a189-efd7aa1c2e81 (old id 4364106)
date added to LUP
2014-04-23 13:53:17
date last changed
2017-08-27 04:57:45
@article{2383d1c1-c446-4842-a189-efd7aa1c2e81,
  abstract     = {The honeycomb lattice material Li2RuO3 undergoes a dimerization of Ru4+ cations on cooling below 270 degrees C, where the magnetic susceptibility vanishes. We use density functional theory calculations to show that this reflects the formation of a valence bond crystal, with a strong structural bond disproportionation. On warming, x-ray diffraction shows that discrete threefold symmetry is regained on average, and the dimerization apparently disappears. In contrast, local structural measurements using high-energy x rays show that disordered dimers survive at the nanoscale up to at least 650 degrees C. The high-temperature phase of Li2RuO3 is thus an example of a valence bond liquid, where thermal fluctuations drive resonance between different dimer coverages, a classic analog of the resonating valence bond state often discussed in connection with high-T-c cuprates.},
  articleno    = {081408},
  author       = {Kimber, Simon A. J. and Mazin, I. I. and Shen, Juan and Jeschke, Harald O. and Streltsov, Sergey V. and Argyriou, Dimitri and Valenti, Roser and Khomskii, Daniel I.},
  issn         = {1098-0121},
  language     = {eng},
  number       = {8},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Valence bond liquid phase in the honeycomb lattice material Li2RuO3},
  url          = {http://dx.doi.org/10.1103/PhysRevB.89.081408},
  volume       = {89},
  year         = {2014},
}