Doping effects on the valence bond solid of Li$_{2}$RuO$_{3}$ with Mn substitution

TL;DR

This study investigates how Mn doping affects the valence bond solid state in Li₂RuO₃, revealing that local dimer structures are robust against doping up to x=0.2, despite changes in the average crystal structure.

Contribution

It demonstrates that the local dimer structure in Li₂RuO₃ persists with Mn doping, highlighting the local nature of dimer formation driven by orbitally-assisted metal-metal bonds.

Findings

Valence bond solid state stable up to x=0.2 Mn doping

Local dimer structure remains robust despite doping

Dimer formation driven by orbitally-assisted metal-metal bonds

Abstract

$Li_{2}RuO_{3}$ with a honeycomb structure undergoes a drastic transition from a regular honeycomb lattice with the $C2/m$ space group to a valence bond solid state of the $P2_{1}/m$ space group with an extremely strong dimerization at 550 K. We synthesized $Li_{2}Ru_{1-x}Mn_{x}O_{3}$ with a full solid solution and investigated doping effects on the valence bond solid state as a function of Mn content. The valence bond solid state is found to be stable up to $x = 0.2$, based on our extensive experiments: structural studies, resistivity, and magnetic susceptibility. On the other hand, the extended x-ray absorption fine structure analyses show that the dimer local structure remains robust even above $x = 0.2$ with a minimal effect on the dimer bond length. This indicates that the locally-disordered dimer structure survives well into the Mn-rich phase even though the thermodynamically stable average structure has the $C2/m$ space group. Our results prove that the dimer formation in $Li_{2}RuO_{3}$ is predominantly a local phenomenon driven by the formation of orbitally-assisted metal-metal bonds and that these dimers are relatively robust against doping-induced disorder.