Metallic and Insulating Oxide Interfaces Controlled by Electronic Correlations

Title
Metallic and Insulating Oxide Interfaces Controlled by Electronic Correlations
Authors
장호원D. A. FelkerC. W. BarkY. WangM. K. NiranjanC. T. NelsonY. ZhangD. SuC. M. FolkmanS. H. BaekS. LeeK. JanickaY. ZhuX. Q. PanD. D. FongE. Y. TsymbalM. S. RzchowskiC. B. Eom
Keywords
2DEG; oxide interfaces; electronic correlations; rare-earth oxide; strontium titanate
Issue Date
2011-02
Publisher
Science
Citation
VOL 331, 886-889
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) [(R is lanthanum (La), praseodymium (Pr), neodymium (Nd), samarium (Sm), or yttrium (Y)] into an epitaxial strontium titanate oxide (SrTiO3) 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 SrTiO3 matrix. Such correlation effects can lead to new functionalities in designed heterostructures.
URI
http://pubs.kist.re.kr/handle/201004/39443
ISSN
0036-8075
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KIST Publication > Article
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