AI 中文总结
本文研究NdNiO₃与NdMnO₃超晶格，发现界面电荷转移与对称性破缺驱动轨道重构，产生室温铁磁绝缘态，为自旋电子学应用提供了新途径。
AI 中文摘要
电子关联、跃迁以及配体到金属的电荷转移共同导致了3d过渡金属氧化物中丰富的电子和磁现象，其中定向d轨道使跃迁对依赖于对称性的轨道重叠高度敏感。具有原子级平整界面的异质结构工程引入了对称性破缺电荷转移，成为产生新现象的又一途径，但超晶格组成氧化物之间的界面失配是否在不依赖外延应变的情况下影响基态仍未明确。本文研究了NdNiO₃与莫特绝缘NdMnO₃构成的超晶格，通过改变层厚并结合输运测量与X射线光谱，表明电子从NdMnO₃转移至NdNiO₃会驱动产生具有独特电子结构的室温绝缘态，同时轨道对称性发生反转，超出了简单应变的考量，凸显了界面的核心作用。这些重构稳定了由界面Ni²⁺-O-Mn⁴⁺超交换产生的 emergent 铁磁绝缘态。本研究确立了通过竞争相互作用实现界面工程铁磁绝缘相的途径，在自旋电子学应用方面具有潜力。
英文摘要
Electron correlation, hopping, and ligand-to-metal charge transfer collectively lead to diverse electronic and magnetic phenomena in 3$d$ transition-metal oxides, where directional d orbitals make hopping highly sensitive to symmetry-dependent orbital overlap. Heterostructure engineering with atomically flat interfaces adds symmetry-breaking charge transfer as a further route to emergent behavior, yet whether interfacial mismatch between constituent oxides of a superlattice shapes ground states independent of epitaxial strain remains unresolved. Here we examine superlattices combining NdNiO$_3$ with Mott-insulating NdMnO$_3$. Varying layer thickness and combining transport with X-ray spectroscopy, we show that electron transfer from NdMnO$_3$ to NdNiO$_3$ drives a room-temperature insulating state with a distinct electronic structure, accompanied by a reversal in orbital symmetry beyond simple strain considerations, underscoring the interface's central role. These reconstructions stabilize an emergent ferromagnetic insulating state arising from interfacial Ni$^{2+}$-O-Mn$^{4+}$ superexchange. Our results establish a pathway to interface-engineered ferromagnetic insulating phases via competing interactions, with potential for spin-insulatronic applications.
Comments5 figures, 12 pages
