2024-12-18 パシフィック・ノースウェスト国立研究所 (PNNL)
＜関連情報＞
- https://www.pnnl.gov/publications/unraveling-charge-transfer-oxide-heterointerfaces
- https://www.science.org/doi/10.1126/sciadv.adq6687
LaNiO3/LaFeO3超格子の界面電荷移動と輸送特性への影響 Interfacial charge transfer and its impact on transport properties of LaNiO3/LaFeO3 superlattices
Le Wang, Zhifei Yang, Krishna Prasad Koirala, Mark E. Bowden, […], and Yingge Du
Science Advances Published:18 Dec 2024
DOI:https://doi.org/10.1126/sciadv.adq6687
Abstract
Charge transfer or redistribution at oxide heterointerfaces is a critical phenomenon, often leading to remarkable properties such as two-dimensional electron gas and interfacial ferromagnetism. Despite studies on LaNiO3/LaFeO3 superlattices and heterostructures, the direction and magnitude of the charge transfer remain debated, with some suggesting no charge transfer due to the high stability of Fe3+ (3d5). Here, we synthesized a series of epitaxial LaNiO3/LaFeO3 superlattices and demonstrated partial (up to ~0.5 e−/interface unit cell) charge transfer from Fe to Ni near the interface, supported by density functional theory simulations and spectroscopic evidence of changes in Ni and Fe oxidation states. The electron transfer from LaFeO3 to LaNiO3 and the subsequent rearrangement of the Fe 3d band create an unexpected metallic ground state within the LaFeO3 layer, strongly influencing the in-plane transport properties across the superlattice. Moreover, we establish a direct correlation between interfacial charge transfer and in-plane electrical transport properties, providing insights for designing functional oxide heterostructures with emerging properties.
