论文标题
li $ _ {2} $ ruo $ _ {3} $的价值债券固体的掺杂效果
Doping effects on the valence bond solid of Li$_{2}$RuO$_{3}$ with Mn substitution
论文作者
论文摘要
$ li_ {2} ruo_ {3} $带有蜂窝结构的结构从常规的蜂窝晶格（$ c2/m $ $ space group）急剧过渡到$ p2_ {1}/m $太空集团的价值固体状态，并在550 k中实现了极强的二聚体。我们合成了550 k。 $ li_ {2} ru_ {1-x} mn_ {x} o_ {3} $带有完整的实心解决方案，并研究了对价键固态的掺杂效果，这是MN内容的函数。根据我们的广泛实验，发现价值键固态最高$ x = 0.2 $稳定：结构性研究，电阻率和磁敏感性。另一方面，扩展的X射线吸收精细结构分析表明，二聚体本地结构甚至在$ x = 0.2 $以上，对二聚体键长的影响也很小。这表明，即使热力学稳定的平均结构具有$ C2/m $空间群，但局部排序的二聚体结构仍可以在富含MN的阶段中生存。我们的结果证明，$ li_ {2} ruo_ {3} $中的二聚体形成主要是局部现象，这是由轨道辅助的金属金属键的形成驱动的，并且这些二聚体相对可靠地抗掺杂诱导的疾病。
$Li_{2}RuO_{3}$ 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.
