Effect of disorder on the dimer transition of the honeycomb-lattice compound Li${}_2$RuO${}_3$

Abstract

We report the dependence of magnetic properties on the crystalline disorder in Li${}_2$RuO${}_3$ with Ru honeycomb lattice. This oxide exhibits unconventional Ru-dimer transition below $T_{\text{d}}\sim$ 540 K. We demonstrate that the cell parameters, related to the coherence of the dimer formation, are strongly dependent on the synthesis procedure. We show that the magnetic behavior at the dimer transition is closely related to the lattice parameters. In particular, we revealed that samples with well-ordered dimers exhibit a first-order magnetic transition with the onset exceeding 550~K, higher than that reported previously. We discuss possible dimer configurations leading to this magneto-lattice coupling.

arXiv comment6 figures, 7 pages

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• First-order magneto-structural transition in single crystals of the honeycomb lattice Ruthenate Li${}_2$RuO${}_3$
• Magnetic and electrical anisotropy with correlation and orbital effects in dimerized honeycomb ruthenate Li${}_2$RuO${}_3$
• Dimerization in honeycomb Na2RuO3 under pressure: a DFT study
• Effect of delithiation on the dimer transition of the honeycomb-lattice ruthenate Li${}_{2-x}$RuO${}_3$
• Effect of Ti-doping on the dimer transition in Lithium Ruthenate