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

Cao, Yanwei; Liu, Xiaoran; Kareev, M.; Choudhury, D.; Middey, S.; Meyers, D.; Kim, J. -W.; Ryan, P. J.; Freeland, J. W.; Chakhalian, J.

doi:10.1038/ncomms10418

Title: Engineered Mott ground state in a LaTiO_3+δ/LaNiO₃ heterostructure

Journal Article · Thu Jan 21 00:00:00 EST 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms10418· OSTI ID:1241364

Cao, Yanwei ^[1]; Liu, Xiaoran ^[1]; Kareev, M. ^[1]; Choudhury, D. ^[2]; Middey, S. ^[1]; Meyers, D. ^[1]; Kim, J. -W. ^[3]; Ryan, P. J. ^[3]; Freeland, J. W. ^[3]; Chakhalian, J. ^[1]

Univ. of Arkansas, Fayetteville, AR (United States)
Univ. of Arkansas, Fayetteville, AR (United States); Indian Institute of Technology Kharagpur, Kharagpur (India)
Argonne National Lab. (ANL), Argonne, IL (United States)

In pursuit of creating cuprate-like electronic and orbital structures, artificial heterostructures based on LaNiO₃ 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 from 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 a correlated metal LaNiO₃ and a doped Mott insulator LaTiO_3+δ, 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_g orbital band splitting. Here, our findings demonstrate how the control over charge at the interface can be effectively used to create exotic electronic, orbital and spin states.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

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

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1241364

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 62 works

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Title: Engineered Mott ground state in a LaTiO_3+δ/LaNiO₃ heterostructure