Taylor A E, Calder S, Morrow R, Feng H L, Upton M H, Lumsden M D, Yamaura K, Woodward P M, Christianson A D
Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Department of Chemistry, The Ohio State University, Columbus, Ohio 43210-1185, USA.
Phys Rev Lett. 2017 May 19;118(20):207202. doi: 10.1103/PhysRevLett.118.207202. Epub 2017 May 16.
Entanglement of spin and orbital degrees of freedom drives the formation of novel quantum and topological physical states. Here we report resonant inelastic x-ray scattering measurements of the transition metal oxides Ca_{3}LiOsO_{6} and Ba_{2}YOsO_{6}, which reveals a dramatic spitting of the t_{2g} manifold. We invoke an intermediate coupling approach that incorporates both spin-orbit coupling and electron-electron interactions on an even footing and reveal that the ground state of 5d^{3}-based compounds, which has remained elusive in previously applied models, is a novel spin-orbit entangled J=3/2 electronic ground state. This work reveals the hidden diversity of spin-orbit controlled ground states in 5d systems and introduces a new arena in the search for spin-orbit controlled phases of matter.
自旋与轨道自由度的纠缠驱动了新型量子和拓扑物理态的形成。在此，我们报告了对过渡金属氧化物Ca₃LiOsO₆和Ba₂YOsO₆的共振非弹性X射线散射测量结果，该结果揭示了t₂g多重态的显著分裂。我们采用一种中间耦合方法，该方法在同等基础上纳入了自旋轨道耦合和电子 - 电子相互作用，并揭示出基于5d³的化合物的基态是一种新型的自旋轨道纠缠J = 3/2电子基态，这在先前应用的模型中一直难以捉摸。这项工作揭示了5d系统中自旋轨道控制基态的隐藏多样性，并为寻找自旋轨道控制的物质相引入了一个新领域。
