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Title: Valence bond liquid phase in the honeycomb lattice material Li 2 Ru O 3
Authors: Kimber, S. A. J.
Mazin, I. I.
Shen, J.
Jeschke, H. O.
Streltsov, S. V.
Argyriou, D. N.
Valentí, R.
Khomskii, D. I.
Issue Date: 2014
Citation: Valence bond liquid phase in the honeycomb lattice material Li 2 Ru O 3 / S. A. J. Kimber, I. I. Mazin, J. Shen, et al. — DOI 10.1103/PhysRevB.89.081408 // Physical Review B - Condensed Matter and Materials Physics. — 2014. — Vol. 89. — Iss. 8. — 081408.
Abstract: The honeycomb lattice material Li2RuO3 undergoes a dimerization of Ru4+ cations on cooling below 270â̂̃C, 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 â̂̃C. 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-Tc cuprates. © 2014 American Physical Society.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84897677581
PURE ID: 350325
ISSN: 10980121
DOI: 10.1103/PhysRevB.89.081408
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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