期刊
PHYSICAL REVIEW B
卷 89, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.081408
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资金
- ESRF
- Office of Naval Research (ONR) through the Naval Research Laboratory
- German Science Foundation (DFG) [SFB/TRR 49, FOR 1346]
- Russian Foundation for Basic Research
- Ministry of Education and Science of Russia for Research Programs [RFFI-13-02-00374, MK-3443.2013.2]
- DFG [FOR 1346, 1484/2-1]
- Cologne University via the German excellence initiative
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.
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