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Engineered Mott ground state in a LaTiO3+δ/LaNiO3 heterostructure

In pursuit of creating cuprate-like electronic and orbital structures, artificial heterostructures based on LaNiO$_3$ have inspired a wealth of exciting experimental and theoretical results. However, to date there is a very limited experimental understanding of the electronic and orbital states emer... Full description

Journal Title: Nature Communications 2016, Vol.7
Main Author: Yanwei Cao
Other Authors: Xiaoran Liu , M. Kareev , D. Choudhury , S. Middey , D. Meyers , J.-W. Kim , P. J. Ryan , J.W. Freeland , J. Chakhalian
Format: Electronic Article Electronic Article
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ID: ISSN: 2041-1723 ; E-ISSN: 2041-1723 ; DOI: 10.1038/ncomms10418
Link: http://dx.doi.org/10.1038/ncomms10418
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recordid: nature_a10.1038/ncomms10418
title: Engineered Mott ground state in a LaTiO3+δ/LaNiO3 heterostructure
format: Article
creator:
  • Yanwei Cao
  • Xiaoran Liu
  • M. Kareev
  • D. Choudhury
  • S. Middey
  • D. Meyers
  • J.-W. Kim
  • P. J. Ryan
  • J.W. Freeland
  • J. Chakhalian
subjects:
  • Condensed Matter - Strongly Correlated Electrons
  • Condensed Matter - Materials Science
ispartof: Nature Communications, 2016, Vol.7
description: In pursuit of creating cuprate-like electronic and orbital structures, artificial heterostructures based on LaNiO$_3$ have inspired a wealth of exciting experimental and theoretical results. However, to date there is a very limited experimental understanding of the electronic and orbital states emerging after interfacial charge-transfer and their connections to the modified band structure at the interface. Towards this goal, we have synthesized a prototypical superlattice composed of correlated metal LaNiO$_3$ and doped Mott insulator LaTiO$_{3+\delta}$, and investigated its electronic structure by resonant X-ray absorption spectroscopy combined with X-ray photoemission spectroscopy, electrical transport and theory calculations. The heterostructure exhibits interfacial charge-transfer from Ti to Ni sites giving rise to an insulating ground state with orbital polarization and $e_\textrm{g}$ orbital band splitting. Our findings demonstrate how the control over charge at the interface can be effectively used to create exotic electronic, orbital and spin states. Comment: 4 figures
language:
source:
identifier: ISSN: 2041-1723 ; E-ISSN: 2041-1723 ; DOI: 10.1038/ncomms10418
fulltext: fulltext
issn:
  • 2041-1723
  • 20411723
url: Link


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titleEngineered Mott ground state in a LaTiO3+δ/LaNiO3 heterostructure
creatorYanwei Cao ; Xiaoran Liu ; M. Kareev ; D. Choudhury ; S. Middey ; D. Meyers ; J.-W. Kim ; P. J. Ryan ; J.W. Freeland ; J. Chakhalian
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descriptionIn pursuit of creating cuprate-like electronic and orbital structures, artificial heterostructures based on LaNiO$_3$ have inspired a wealth of exciting experimental and theoretical results. However, to date there is a very limited experimental understanding of the electronic and orbital states emerging after interfacial charge-transfer and their connections to the modified band structure at the interface. Towards this goal, we have synthesized a prototypical superlattice composed of correlated metal LaNiO$_3$ and doped Mott insulator LaTiO$_{3+\delta}$, and investigated its electronic structure by resonant X-ray absorption spectroscopy combined with X-ray photoemission spectroscopy, electrical transport and theory calculations. The heterostructure exhibits interfacial charge-transfer from Ti to Ni sites giving rise to an insulating ground state with orbital polarization and $e_\textrm{g}$ orbital band splitting. Our findings demonstrate how the control over charge at the interface can be effectively used to create exotic electronic, orbital and spin states. Comment: 4 figures
subjectCondensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science;
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