Cationic Disorder and Phase Segregation in LaAlO3/SrTiO3 Heterointerfaces Evidenced by Medium-Energy Ion Spectroscopy

被引：115

作者：

Kalabukhov, A. S. ^{[1
]}

Boikov, Yu. A. ^{[2
]}

Serenkov, I. T. ^{[2
]}

Sakharov, V. I. ^{[2
]}

Popok, V. N. ^{[3
]}

Gunnarsson, R. ^{[1
,4
]}

Borjesson, J. ^{[1
]}

Ljustina, N. ^{[1
]}

Olsson, E. ^{[1
]}

Winkler, D. ^{[1
]}

Claeson, T. ^{[1
]}

机构：

[1] Chalmers, S-41296 Gothenburg, Sweden

[2] Russian Acad Sci, AF Ioffe Phys Tech Inst, St Petersburg 196140, Russia

[3] Univ Gothenburg, Dept Phys, Gothenburg, Sweden

[4] Jonkoping Univ, HLK, Jonkoping, Sweden

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 14期

基金：

瑞典研究理事会;

关键词：

SURFACE; SCATTERING; RESOLUTION; GROWTH; YBACUO; SRTIO3;

D O I：

10.1103/PhysRevLett.103.146101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Medium-energy ion spectroscopy (MEIS) has been used to study the depth profile and deduce the distribution of possible cationic substitutions in LaAlO3/SrTiO3 (LAO/STO) heterointerfaces. Analysis of La and Sr peaks in aligned and random MEIS spectra indicates that the surface layers of LAO on an STO substrate are not homogeneous and stoichiometric if the film thickness is less than 4 unit cell layers. This is possibly caused by a redistribution of La and Sr at the interface. Kelvin probe force microscopy reveals an inhomogeneous distribution of the surface potential in a 4 unit cell LAO film, indicating micrometer-sized regions of different compositions. Our findings provide a novel view on the microstructural origin of the electrically conductive interfaces.

引用

页数：4

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