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Title: Strong Orbital Polarization in a Cobaltate-Titanate Oxide Heterostructure

Abstract

Through a combination of experimental measurements and theoretical modeling, we describe a strongly orbital-polarized insulating ground state in an (LaTiO3)(2)/(LaCoO3)(2 )oxide heterostructure. X-ray absorption spectra and ab initio calculations show that an electron is transferred from the titanate to the cobaltate layers. The charge transfer, accompanied by a large octahedral distortion, induces a substantial orbital polarization in the cobaltate layer of a size unattainable via epitaxial strain alone. The asymmetry between in-plane and out-of-plane orbital occupancies in the high-spin cobaltate layer is predicted by theory and observed through x-ray linear dichroism experiments. Manipulating orbital configurations using interfacial coupling within heterostructures promises exciting ground-state engineering for realizing new emergent electronic phases in metal oxide superlattices.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Air Force Research Laboratory (AFRL) - Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); USDOE Office of Science - Early Career Award
OSTI Identifier:
1575065
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 11
Country of Publication:
United States
Language:
English

Citation Formats

Lee, Sangjae, Georgescu, Alexandru B., Lee, Alex T., Fabbris, Gilberto, Freeland, John W., Disa, Ankit S., Jia, Yichen, Dean, Mark P. M., Walker, Frederick J., Ismail-Beigi, Sohrab, and Ahn, Charles H. Strong Orbital Polarization in a Cobaltate-Titanate Oxide Heterostructure. United States: N. p., 2019. Web. doi:10.1103/physrevlett.123.117201.
Lee, Sangjae, Georgescu, Alexandru B., Lee, Alex T., Fabbris, Gilberto, Freeland, John W., Disa, Ankit S., Jia, Yichen, Dean, Mark P. M., Walker, Frederick J., Ismail-Beigi, Sohrab, & Ahn, Charles H. Strong Orbital Polarization in a Cobaltate-Titanate Oxide Heterostructure. United States. doi:10.1103/physrevlett.123.117201.
Lee, Sangjae, Georgescu, Alexandru B., Lee, Alex T., Fabbris, Gilberto, Freeland, John W., Disa, Ankit S., Jia, Yichen, Dean, Mark P. M., Walker, Frederick J., Ismail-Beigi, Sohrab, and Ahn, Charles H. Tue . "Strong Orbital Polarization in a Cobaltate-Titanate Oxide Heterostructure". United States. doi:10.1103/physrevlett.123.117201.
@article{osti_1575065,
title = {Strong Orbital Polarization in a Cobaltate-Titanate Oxide Heterostructure},
author = {Lee, Sangjae and Georgescu, Alexandru B. and Lee, Alex T. and Fabbris, Gilberto and Freeland, John W. and Disa, Ankit S. and Jia, Yichen and Dean, Mark P. M. and Walker, Frederick J. and Ismail-Beigi, Sohrab and Ahn, Charles H.},
abstractNote = {Through a combination of experimental measurements and theoretical modeling, we describe a strongly orbital-polarized insulating ground state in an (LaTiO3)(2)/(LaCoO3)(2 )oxide heterostructure. X-ray absorption spectra and ab initio calculations show that an electron is transferred from the titanate to the cobaltate layers. The charge transfer, accompanied by a large octahedral distortion, induces a substantial orbital polarization in the cobaltate layer of a size unattainable via epitaxial strain alone. The asymmetry between in-plane and out-of-plane orbital occupancies in the high-spin cobaltate layer is predicted by theory and observed through x-ray linear dichroism experiments. Manipulating orbital configurations using interfacial coupling within heterostructures promises exciting ground-state engineering for realizing new emergent electronic phases in metal oxide superlattices.},
doi = {10.1103/physrevlett.123.117201},
journal = {Physical Review Letters},
number = 11,
volume = 123,
place = {United States},
year = {2019},
month = {9}
}

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