Kimber, Simon A. J., Mazin, I. I., Shen, Juan, Jeschke, Harald O., Streltsov, Sergey V., Argyriou, Dimitri N., Valenti, Roser and Khomskii, Daniel I. (2014). Valence bond liquid phase in the honeycomb lattice material Li2RuO3. Phys. Rev. B, 89 (8). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Kimber, Simon A. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mazin, I. I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shen, JuanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jeschke, Harald O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Streltsov, Sergey V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Argyriou, Dimitri N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Valenti, RoserUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Khomskii, Daniel I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-445675
DOI: 10.1103/PhysRevB.89.081408
Journal or Publication Title: Phys. Rev. B
Volume: 89
Number: 8
Date: 2014
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
TRANSITIONSMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/44567

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