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Title: Metallic and Insulating Oxide Interfaces Controlled by Electronic Correlations

Abstract

The formation of two-dimensional electron gases (2DEGs) at complex oxide interfaces is directly influenced by the oxide electronic properties. We investigated how local electron correlations control the 2DEG by inserting a single atomic layer of a rare-earth oxide (RO) [RO is lanthanum (La), praseodymium (Pr), neodymium (Nd), samarium (Sm), or yttrium (Y)] into an epitaxial strontium titanate oxide (SrTiO{sub 3}) matrix using pulsed-laser deposition with atomic layer control. We find that structures with La, Pr, and Nd ions result in conducting 2DEGs at the inserted layer, whereas the structures with Sm or Y ions are insulating. Our local spectroscopic and theoretical results indicate that the interfacial conductivity is dependent on electronic correlations that decay spatially into the SrTiO{sub 3} matrix. Such correlation effects can lead to new functionalities in designed heterostructures.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Org.:
DOE - OFFICE OF SCIENCE
OSTI Identifier:
1020889
Report Number(s):
BNL-94749-2011-JA
Journal ID: ISSN 0036-8075; SCIEAS; R&D Project: NC-001; TRN: US201116%%915
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Science (Washington, D.C.)
Additional Journal Information:
Journal Volume: 331; Journal Issue: 6019; Journal ID: ISSN 0036-8075
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY AND ECONOMY; DECAY; DEPOSITION; ELECTRON CORRELATION; ELECTRONS; GASES; LANTHANUM; NEODYMIUM; OXIDES; PRASEODYMIUM; SAMARIUM; STRONTIUM TITANATES; YTTRIUM; two-dimensional electron gas; strongly-correlated materials; SrTiO3; functional nanomaterials

Citation Formats

Jang, H W, Su, D, Jang, H W, Felker, D A, Bark, C W, Wang, Y, Niranjan, M K, Nelson, C T, Zhang, Y, Folkman, C M, Baek, S H, Lee, S, Janicka, K, Zhu, Y, Pan, X Q, Fong, D D, Tsymbal, E Y, Rzchowski, M S, and Eom, C B. Metallic and Insulating Oxide Interfaces Controlled by Electronic Correlations. United States: N. p., 2011. Web. doi:10.1126/science.1198781.
Jang, H W, Su, D, Jang, H W, Felker, D A, Bark, C W, Wang, Y, Niranjan, M K, Nelson, C T, Zhang, Y, Folkman, C M, Baek, S H, Lee, S, Janicka, K, Zhu, Y, Pan, X Q, Fong, D D, Tsymbal, E Y, Rzchowski, M S, & Eom, C B. Metallic and Insulating Oxide Interfaces Controlled by Electronic Correlations. United States. https://doi.org/10.1126/science.1198781
Jang, H W, Su, D, Jang, H W, Felker, D A, Bark, C W, Wang, Y, Niranjan, M K, Nelson, C T, Zhang, Y, Folkman, C M, Baek, S H, Lee, S, Janicka, K, Zhu, Y, Pan, X Q, Fong, D D, Tsymbal, E Y, Rzchowski, M S, and Eom, C B. 2011. "Metallic and Insulating Oxide Interfaces Controlled by Electronic Correlations". United States. https://doi.org/10.1126/science.1198781.
@article{osti_1020889,
title = {Metallic and Insulating Oxide Interfaces Controlled by Electronic Correlations},
author = {Jang, H W and Su, D and Jang, H W and Felker, D A and Bark, C W and Wang, Y and Niranjan, M K and Nelson, C T and Zhang, Y and Folkman, C M and Baek, S H and Lee, S and Janicka, K and Zhu, Y and Pan, X Q and Fong, D D and Tsymbal, E Y and Rzchowski, M S and Eom, C B},
abstractNote = {The formation of two-dimensional electron gases (2DEGs) at complex oxide interfaces is directly influenced by the oxide electronic properties. We investigated how local electron correlations control the 2DEG by inserting a single atomic layer of a rare-earth oxide (RO) [RO is lanthanum (La), praseodymium (Pr), neodymium (Nd), samarium (Sm), or yttrium (Y)] into an epitaxial strontium titanate oxide (SrTiO{sub 3}) matrix using pulsed-laser deposition with atomic layer control. We find that structures with La, Pr, and Nd ions result in conducting 2DEGs at the inserted layer, whereas the structures with Sm or Y ions are insulating. Our local spectroscopic and theoretical results indicate that the interfacial conductivity is dependent on electronic correlations that decay spatially into the SrTiO{sub 3} matrix. Such correlation effects can lead to new functionalities in designed heterostructures.},
doi = {10.1126/science.1198781},
url = {https://www.osti.gov/biblio/1020889}, journal = {Science (Washington, D.C.)},
issn = {0036-8075},
number = 6019,
volume = 331,
place = {United States},
year = {Fri Feb 18 00:00:00 EST 2011},
month = {Fri Feb 18 00:00:00 EST 2011}
}