Metallic and Insulating Oxide Interfaces Controlled by Electronic Correlations

被引：213

作者：

Jang, H. W. ^{[1
]}

Felker, D. A. ^{[2
]}

Bark, C. W. ^{[1
]}

Wang, Y. ^{[3
]}

Niranjan, M. K. ^{[3
]}

Nelson, C. T. ^{[4
]}

Zhang, Y. ^{[4
,5
,6
]}

Su, D. ^{[7
]}

Folkman, C. M. ^{[1
]}

Baek, S. H. ^{[1
]}

Lee, S. ^{[1
]}

Janicka, K. ^{[3
]}

Zhu, Y. ^{[7
]}

Pan, X. Q. ^{[4
]}

Fong, D. D. ^{[8
]}

Tsymbal, E. Y. ^{[3
]}

Rzchowski, M. S. ^{[2
]}

Eom, C. B. ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA

[2] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[3] Univ Nebraska, Dept Phys & Astron, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA

[4] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

[5] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

[6] Nanjing Univ, Dept Mat Sci & Engn, Nanjing 210093, Peoples R China

[7] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA

[8] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

SCIENCE | 2011年 / 331卷 / 6019期

基金：

美国国家科学基金会;

关键词：

HETEROSTRUCTURE; SUPERLATTICES; TRANSITIONS;

D O I：

10.1126/science.1198781

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：886 / 889

页数：4

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