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Valence bond liquid phase in the honeycomb lattice material Li2RuO3

Författare

  • Simon A. J. Kimber
  • I. I. Mazin
  • Juan Shen
  • Harald O. Jeschke
  • Sergey V. Streltsov
  • Dimitri Argyriou
  • Roser Valenti
  • Daniel I. Khomskii

Summary, in English

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.

Publiceringsår

2014

Språk

Engelska

Publikation/Tidskrift/Serie

Physical Review B (Condensed Matter and Materials Physics)

Volym

89

Issue

8

Dokumenttyp

Artikel i tidskrift

Förlag

American Physical Society

Ämne

  • Atom and Molecular Physics and Optics
  • Physical Sciences
  • Natural Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1098-0121