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.:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); 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:
- 1560900
- Alternate Identifier(s):
- OSTI ID: 1546049; OSTI ID: 1575065
- Report Number(s):
- BNL-211921-2019-JAAM
Journal ID: ISSN 0031-9007; PRLTAO; 117201
- Grant/Contract Number:
- 1047478; SC0012704; AC02-06CH11357
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Name: Physical Review Letters Journal Volume: 123 Journal Issue: 11; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Lee, Sangjae, Lee, Alex Taekyung, Georgescu, Alexandru B., Fabbris, Gilberto, Han, Myung-Geun, Zhu, Yimei, 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, Lee, Alex Taekyung, Georgescu, Alexandru B., Fabbris, Gilberto, Han, Myung-Geun, Zhu, Yimei, 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. https://doi.org/10.1103/PhysRevLett.123.117201
Lee, Sangjae, Lee, Alex Taekyung, Georgescu, Alexandru B., Fabbris, Gilberto, Han, Myung-Geun, Zhu, Yimei, 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. https://doi.org/10.1103/PhysRevLett.123.117201.
@article{osti_1560900,
title = {Strong Orbital Polarization in a Cobaltate-Titanate Oxide Heterostructure},
author = {Lee, Sangjae and Lee, Alex Taekyung and Georgescu, Alexandru B. and Fabbris, Gilberto and Han, Myung-Geun and Zhu, Yimei 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 = {Tue Sep 10 00:00:00 EDT 2019},
month = {Tue Sep 10 00:00:00 EDT 2019}
}
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