Cation intermixing and electronic deviations at the insulating LaCrO3/SrTiO3(001) interface

被引：21

作者：

Colby, R. ^{[1
]}

Qiao, L. ^{[2
]}

Zhang, K. H. L. ^{[2
]}

Shutthanandan, V. ^{[1
]}

Ciston, J. ^{[3
]}

Kabius, B. ^{[1
]}

Chambers, S. A. ^{[2
]}

机构：

[1] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA

[2] Pacific NW Natl Lab, Fundamental & Computat Sci Directorate, Richland, WA 99352 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 15期

关键词：

OXIDE INTERFACES; STOICHIOMETRY; CHROMIUM; GROWTH; CHARGE;

D O I：

10.1103/PhysRevB.88.155325

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The interface between polar perovskite LaCrO3 and nonpolar SrTiO3(001) grown by molecular beam epitaxy is examined using a combination of electron microscopy, spectroscopy, and Rutherford backscattering spectrometry. The A-site cations of these ABO(3) perovskites are found to diffuse across the interface to a greater extent than the B-site cations, based on high-angle annular dark-field scanning transmission electron microscopy, energy-dispersive x-ray spectroscopy, and electron-energy-loss spectroscopy (EELS). The B-site cation valences are shown to be partially reduced near the interface by analysis of EELS near-edge structures. The location and direction of these electronic modifications do not intuitively compensate the charge imbalance imposed by uneven cation interdiffusion, and yet both the film and interface are insulating. These results highlight the importance of considering both the physical and electronic structure of such complex interfaces in determining their characteristics.

引用

页数：9

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