Competing spin-orbital singlet states in the 4d4 honeycomb ruthenate Ag3LiRu2O6
Competing spin-orbital singlet states in the 4d4 honeycomb ruthenate Ag3LiRu2O6
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4d4 蜂窝状钌酸盐 Ag3LiRu2O6 中的竞争自旋轨道单线态
DOI：
10.1103/physrevresearch.4.043079
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发表时间：
2022
影响因子：
4.2
通讯作者：
..... (計28名））
中科院分区：
文献类型：
--
作者：
Takayama T.;...;Irifune T.（22）;..... (計28名））
当自旋轨道纠缠的电子驻留在蜂窝晶格上时，丰富的量子态预计会出现，如Kitaev材料所示。不同的但同样有趣的物理学可以实现与a-电子计数以外。的磁化强度，核磁共振（NMR），和非弹性中子散射测量，连同量子化学计算，表明在环境压力下的层状rechenatewithions形成一个蜂窝晶格的自旋轨道纠缠单态，这是一个操场受挫激子磁性。在压力下，单重态不开发预期的激子磁性，但两个连续的过渡到其他的双相被发现在NMR，中子衍射，和X射线吸收精细结构测量，首先到一个中间相与适度变形的蜂窝晶格，并最终到一个高压相非常短的钌-钌二聚体键。虽然在高压相的强二聚起源于分子轨道形成的姐妹化合物，我们认为，中间相代表的自旋轨道耦合的单重态二聚体状态，这是稳定的混合物的上位衍生状态通过伪Jahn-Teller效应。竞争电子相的出现展示了蜂窝状化合物丰富的自旋轨道物理，这一发现为实现非常规磁性铺平了道路。
When spin-orbit-entangledelectrons reside on a honeycomb lattice, rich quantum states are anticipated to emerge, as exemplified by theKitaev materials. Distinct yet equally intriguing physics may be realized with a-electron count other than. The magnetization,-nuclear magnetic resonance (NMR), and inelastic neutron scattering measurements, together with the quantum chemistry calculation, indicate that the layered ruthenatewithions at ambient pressure forms a honeycomb lattice of spin-orbit-entangled singlets, which is a playground for frustrated excitonic magnetism. Under pressure, the singlet state does not develop the expected excitonic magnetism, but two successive transitions to other nonmagnetic phases were found in-NMR, neutron diffraction, and x-ray absorption fine structure measurements, first to an intermediate phase with moderate distortion of honeycomb lattice and eventually to a high-pressure phase with very short Ru-Ru dimer bonds. While the strong dimerization in the high-pressure phase originates from a molecular orbital formation as in the sister compound, we argue that the intermediate phase represents a spin-orbit-coupled singlet dimer state which is stabilized by the admixture of upper-lying-derived states via a pseudo-Jahn-Teller effect. The emergence of competing electronic phases demonstrates rich spin-orbital physics ofhoneycomb compounds, and this finding paves the way for realization of unconventional magnetism.