Elemental and lattice-parameter mapping of binary oxide superlattices of (LaNiO 3 ) 4 /(LaMnO 3 ) 2 at atomic resolution

Kwon, Ji-Hwan; Lu, Ping; Hoffman, Jason; Yuan, Renliang; Yoon, Aram; Bhattacharya, Anand; Zuo, Jian-Min

doi:10.1088/1361-6641/32/1/014002

Title: Elemental and lattice-parameter mapping of binary oxide superlattices of (LaNiO ₃ ) ₄ /(LaMnO ₃ ) ₂ at atomic resolution

Journal Article · Mon Dec 19 00:00:00 EST 2016 · Semiconductor Science and Technology

DOI:https://doi.org/10.1088/1361-6641/32/1/014002· OSTI ID:1357785

Kwon, Ji-Hwan; Lu, Ping; Hoffman, Jason; Yuan, Renliang; Yoon, Aram; Bhattacharya, Anand;

We construct the elemental distribution and lattice strain maps from the measured atomic column positions in a (LaNiO3)(4)/(LaMnO3)(2) superlattice over a large field of view. The correlation between the distribution of B-cations and the lattice parameter in the form of Vegard's law is validated using atomic resolution energy dispersive x-ray spectroscopy (EDS). The maps show negligible Mn intermixing in the LaNiO3 layer, while Ni intermixing in the LaMnO3 layer improves away from the substrate interface to 9.5 atomic% from the 8th period onwards, indicating that the superlattice interfacial sharpness is established as the distance from the substrate increases. The maps allow an observation of the compositional defects of the B-sites, which is not possible by Z-contrast alone. Thus, this study demonstrates a promising approach for atomic scale correlative study of lattice strain and composition, and a method for the calibration of atomic resolution EDS maps.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1357785

Journal Information:: Semiconductor Science and Technology, Vol. 32, Issue 1; ISSN 0268-1242

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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Title: Elemental and lattice-parameter mapping of binary oxide superlattices of (LaNiO 3 ) 4 /(LaMnO 3 ) 2 at atomic resolution

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Title: Elemental and lattice-parameter mapping of binary oxide superlattices of (LaNiO ₃ ) ₄ /(LaMnO ₃ ) ₂ at atomic resolution