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Interfacial charge transfer and its impact on transport properties of LaNiO 3 /LaFeO 3 superlattices

Year: 2024
Type: article
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 LaNiO 3 /LaFeO 3 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 Fe 3+ (3d 5 ). Here, we synthesized a series of epitaxial LaNiO 3 /LaFeO 3 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 LaFeO 3 to LaNiO 3 and the subsequent rearrangement of the Fe 3d band create an unexpected metallic ground state within the LaFeO 3 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.
DOI: 10.1126/sciadv.adq6687
Authors: Le Wang, Zhifei Yang, Krishna Prasad Koirala, Mark E. Bowden, John W. Freeland, Peter V. Sushko, Cheng-Tai Kuo, Scott A. Chambers, Chongmin Wang, Bharat Jalan, Yingge Du
Institutions: Pacific Northwest National Laboratory, University of Minnesota, Argonne National Laboratory, Advanced Photon Source, SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, Environmental Molecular Sciences Laboratory
Language: English
Open Access status: gold
Estimated APC paid: $4,500
Funders: National Science Foundation, U.S. Department of Energy, University of Minnesota, National Energy Research Scientific Computing Center, Office of Science, Division of Materials Research, Basic Energy Sciences, Air Force Office of Scientific Research, Argonne National Laboratory, SLAC National Accelerator Laboratory, Division of Materials Sciences and Engineering
Awards: G1523888516, G2089108170, G2138739886, G273056335, G3090238903, G3196393315, G403942265, G4516736450, G4837814365, G58245830, G6995829561, G743970376, University of Minnesota Materials Research Science and Engineering Center
OpenAlex ID: W4405516952
FWCI: 1.703
Cites: 64
Cited by: 18
Related to: 10