Transition‐metal oxide (TMO) heterostructures provide fertile grounds for creating and manipulating intriguing properties and functionalities. At the interface of TMO heterostructures, electronic reconstructions generally occur via charge transfer and lead to an extraordinary spectrum of emergent phenomena but unattainable in their bulk constituents. However, the basic mechanism of charge transfer at the interface is not fully determined or even understood in heterostructures, which may hide the underlying mechanisms and intriguing physics. Herein, an intrinsic charge transfer and resultant exotic ferromagnetism are unambiguously observed in the heterostructures between the nonmagnetic LaCoO₃ (LCO) and SrTiO₃ (STO). Combining element‐specific X‐ray absorption spectroscopy and atomic multiplet fitting, direct evidence of charge transfer‐induced multivalence of cobalt ions, interactions of which would contribute to the novel magnetism beyond the intuition, in concert with first‐principles density‐functional‐theory calculations, is demonstrated. Beyond LCO/STO system, a more broadly applicable principle for the heterostructures between 3d TMO and STO where charge transfer and resultant multivalence or conducting interfaces are coexistent is establish. This study represents an advance that the electronic reconstruction and the multiple electron configurations of 3d transition metal ions will constitute a powerful tool for the designs of functional materials and creations of unconventional physical properties.

中文翻译：

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电荷转移诱导的多价态，在过渡金属氧化物异质结构中产生新兴的磁性

过渡金属氧化物（TMO）异质结构为创造和操纵引人入胜的特性和功能提供了肥沃的土壤。在TMO异质结构的界面上，电子重建通常通过电荷转移发生，并导致大量异常现象出现，但在其整体组成上是无法达到的。但是，界面上电荷转移的基本机理尚未完全确定，甚至在异质结构中也无法理解，这可能掩盖了潜在的机理和有趣的物理学。在此，在非磁性LaCoO ₃（LCO）和SrTiO ₃之间的异质结构中清晰地观察到本征电荷转移和由此产生的奇特铁磁性。（STO）。结合特定元素的X射线吸收光谱法和原子多重拟合，直接证明电荷转移引起的钴离子多价，其相互作用将与直觉原理密度函数理论相辅相成，超出直觉。计算，证明。除了LCO / STO系统之外，还建立了3d TMO和STO之间异质结构的更广泛适用的原理，在该结构中电荷转移和所得的多价或导电界面共存。这项研究代表了3 d的电子重构和多电子构型的进展 过渡金属离子将成为功能材料设计和非常规物理特性创造的有力工具。