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Title: Interfacial charge-transfer Mott state in iridate-nickelate superlattices

Abstract

We investigate SrIrO3/LaNiO3 superlattices in which we observe a full electron transfer at the interface from Ir to Ni, triggering a massive structural and electronic reconstruction. Through experimental characterization and first-principles calculations, we determine that a large crystal field splitting from the distorted interfacial IrO6 octahedra surprisingly dominates over the spin-orbit coupling and together with the Hund's coupling results in the high-spin (S = 1) configurations on both the Ir and Ni sites. This demonstrates the power of interfacial charge transfer in coupling lattice, charge, orbital, and spin degrees of freedom, opening fresh avenues of investigation of quantum states in oxide superlattices.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Gordon and Betty Moore Foundation; USDOE; US Department of the Navy, Office of Naval Research (ONR); U.S. Department of Defense (DOD); National Science Foundation (NSF)
OSTI Identifier:
1574930
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 116; Journal Issue: 40
Country of Publication:
United States
Language:
English
Subject:
interfacial charge transfer; iridates; nickelates; superlattice

Citation Formats

Liu, Xiaoran, Kotiuga, M., Kim, H. -S., N'Diaye, Alpha T, Choi, Y., Cao, Yanwei, Kareev, M., Wen, F., Pal, B., Freeland, J. W., and Haskel, D. Interfacial charge-transfer Mott state in iridate-nickelate superlattices. United States: N. p., 2019. Web. doi:10.1073/pnas.1907043116.
Liu, Xiaoran, Kotiuga, M., Kim, H. -S., N'Diaye, Alpha T, Choi, Y., Cao, Yanwei, Kareev, M., Wen, F., Pal, B., Freeland, J. W., & Haskel, D. Interfacial charge-transfer Mott state in iridate-nickelate superlattices. United States. doi:10.1073/pnas.1907043116.
Liu, Xiaoran, Kotiuga, M., Kim, H. -S., N'Diaye, Alpha T, Choi, Y., Cao, Yanwei, Kareev, M., Wen, F., Pal, B., Freeland, J. W., and Haskel, D. Tue . "Interfacial charge-transfer Mott state in iridate-nickelate superlattices". United States. doi:10.1073/pnas.1907043116.
@article{osti_1574930,
title = {Interfacial charge-transfer Mott state in iridate-nickelate superlattices},
author = {Liu, Xiaoran and Kotiuga, M. and Kim, H. -S. and N'Diaye, Alpha T and Choi, Y. and Cao, Yanwei and Kareev, M. and Wen, F. and Pal, B. and Freeland, J. W. and Haskel, D.},
abstractNote = {We investigate SrIrO3/LaNiO3 superlattices in which we observe a full electron transfer at the interface from Ir to Ni, triggering a massive structural and electronic reconstruction. Through experimental characterization and first-principles calculations, we determine that a large crystal field splitting from the distorted interfacial IrO6 octahedra surprisingly dominates over the spin-orbit coupling and together with the Hund's coupling results in the high-spin (S = 1) configurations on both the Ir and Ni sites. This demonstrates the power of interfacial charge transfer in coupling lattice, charge, orbital, and spin degrees of freedom, opening fresh avenues of investigation of quantum states in oxide superlattices.},
doi = {10.1073/pnas.1907043116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 40,
volume = 116,
place = {United States},
year = {2019},
month = {10}
}

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