Interface dipole between two metallic oxides caused by localized oxygen vacancies

被引：54

作者：

Borisevich, Albina Y. ^{[1
]}

Lupini, Andrew R. ^{[1
]}

He, Jun ^{[1
,2
]}

Eliseev, Eugene A. ^{[3
]}

Morozovska, Anna N. ^{[4
]}

Svechnikov, George S. ^{[4
]}

Yu, Pu ^{[5
,6
]}

Chu, Ying-Hao ^{[7
]}

Ramesh, Ramamoorthy ^{[5
,6
]}

Pantelides, Sokrates T. ^{[1
,2
]}

Kalinin, Sergei V. ^{[1
]}

Pennycook, Stephen J. ^{[1
,2
]}

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[2] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[3] Natl Acad Sci Ukraine, Inst Problems Mat Sci, UA-03142 Kiev, Ukraine

[4] Natl Acad Sci Ukraine, Inst Semicond Phys, UA-03028 Kiev, Ukraine

[5] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[6] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[7] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 14期

关键词：

FERROMAGNETISM; SUPERLATTICES; EXCHANGE; FIELDS; SCALE;

D O I：

10.1103/PhysRevB.86.140102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Oxygen vacancies are increasingly recognized to play a role in phenomena observed at transition-metal oxide interfaces. Here, we report a study of SrRuO3 and La0.7Sr0.3MnO3 interfaces using a combination of quantitative aberration-corrected scanning transmission electron microscopy, electron energy-loss spectroscopy, and density functional calculations. Cation displacements are observed at the interface, indicative of a dipolelike electric field even though both materials are nominally metallic. The observed displacements are reproduced by theory if O vacancies are present in the near-interface La0.7Sr0.3MnO3 layers. The results suggest that atomic-scale structural mapping can serve as a quantitative indicator of the presence of O vacancies at interfaces.

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页数：6

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