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Effect of disorder on the dimer transition of the honeycomb-lattice compound Li₂RuO₃
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Effect of disorder on the dimer transition of the honeycomb-lattice compound Li₂RuO₃
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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.
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