Department of Physics, Boston College, Chestnut Hill, MA, 02467, USA.
Materials Department, University of California, Santa Barbara, CA, 93106, USA.
Nat Commun. 2018 Jan 9;9(1):103. doi: 10.1038/s41467-017-02647-1.
Materials that exhibit both strong spin-orbit coupling and electron correlation effects are predicted to host numerous new electronic states. One prominent example is the J = 1/2 Mott state in SrIrO, where introducing carriers is predicted to manifest high temperature superconductivity analogous to the S = 1/2 Mott state of LaCuO. While bulk superconductivity currently remains elusive, anomalous quasiparticle behaviors paralleling those in the cuprates such as pseudogap formation and the formation of a d-wave gap are observed upon electron-doping SrIrO. Here we establish a magnetic parallel between electron-doped SrIrO and hole-doped LaCuO by unveiling a spin density wave state in electron-doped SrIrO. Our magnetic resonant X-ray scattering data reveal the presence of an incommensurate magnetic state reminiscent of the diagonal spin density wave state observed in the monolayer cuprate (LaSr )CuO. This link supports the conjecture that the quenched Mott phases in electron-doped SrIrO and hole-doped LaCuO support common competing electronic phases.
材料表现出强的自旋轨道耦合和电子相关效应，预计将具有许多新的电子态。一个突出的例子是 SrIrO 中的 J=1/2 莫特态，其中预计引入载流子将表现出类似于 LaCuO 的 S=1/2 莫特态的高温超导性。尽管块状超导电性目前仍然难以实现，但在电子掺杂 SrIrO 中观察到类似于铜酸盐的异常准粒子行为，如赝能隙形成和 d 波能隙的形成。在这里，我们通过揭示电子掺杂 SrIrO 中的自旋密度波态，建立了电子掺杂 SrIrO 和空穴掺杂 LaCuO 之间的磁平行关系。我们的磁共振 X 射线散射数据揭示了存在一个非共调磁态，类似于在单层铜酸盐 (LaSr)CuO 中观察到的对角自旋密度波态。这种联系支持了这样的假设，即在电子掺杂 SrIrO 和空穴掺杂 LaCuO 中被猝灭的莫特相支持共同的竞争电子相。
