Antiferromagnetic order is a common and robust ground state in the parent (undoped) phase of several strongly correlated electron systems. The progressive weakening of antiferromagnetic correlations upon doping paves the way for a variety of emergent many-electron phenomena including unconventional superconductivity, colossal magnetoresistance, and collective charge-spin-orbital ordering. In this study, we explored the use of oxygen stoichiometry as an alternative pathway to modify the coupled magnetic and electronic ground state in the family of rare earth nickelates (${\mathrm{RENiO}}_{3-x}$). Using a combination of x-ray spectroscopy and resonant soft x-ray magnetic scattering, we find that, while oxygen vacancies rapidly alter the electronic configuration within the Ni and O orbital manifolds, antiferromagnetic order is remarkably robust to substantial levels of carrier doping, only to suddenly collapse beyond 0.21 $e^{-}/\mathrm{Ni}$ without an accompanying structural transition. Our work demonstrates that ordered magnetism in ${\mathrm{RENiO}}_{3-x}$ is mostly insensitive to carrier doping up to significant levels unseen in other transition-metal oxides. The sudden collapse of ordered magnetism upon oxygen removal may provide a new mechanism for solid-state magnetoionic switching and new applications in antiferromagnetic spintronics.

中文翻译：

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缺氧镍酸盐薄膜中磁序突然崩溃

在几个强相关电子系统的母相（未掺杂）中，反铁磁有序是一种常见且鲁棒的基态。掺杂时反铁磁相关性的逐渐减弱为各种新兴的多电子现象铺平了道路，这些现象包括非常规的超导电性，巨大的磁阻和集体的自旋自旋轨道有序。在这项研究中，我们探索了使用氧气化学计量法作为替代途径来修饰稀土镍酸盐家族中耦合的磁和电子基态（${\mathrm{雷尼奥}}_{3-X}$）。通过结合使用X射线光谱学和共振软X射线磁散射，我们发现，尽管氧空位迅速改变了Ni和O轨道歧管内的电子构型，但反铁磁顺序对于载流子掺杂的显着水平却非常强大。突然崩溃超过0.21${Ë}^{-}/你$没有伴随的结构转变。我们的工作表明，有序磁场在${\mathrm{雷尼奥}}_{3-X}$对载流子掺杂至其他过渡金属氧化物所未见的显着水平最不敏感。除氧后有序磁性的突然崩溃可能为固态磁离子交换提供新的机制，并为反铁磁自旋电子学提供新的应用。