Surface segregation and restructuring of colossal-magnetoresistant manganese perovskites La0.65Sr0.35MnO3

被引：173

作者：

Dulli, H ^{[1
]}

Dowben, PA

Liou, SH

Plummer, EW

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA

[3] Univ Nebraska, Behlen Lab Phys, Dept Phys & Astron, Lincoln, NE 68588 USA

[4] Univ Nebraska, Behlen Lab Phys, Ctr Mat Res & Anal, Lincoln, NE 68588 USA

来源：

PHYSICAL REVIEW B | 2000年 / 62卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.62.R14629

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the surface chemical composition of crystalline films of La0.65Sr0.35MnO3 by angleresolved x-ray photoelectron spectroscopy. The surface composition was found to be significantly different from that of the bulk because of an appreciable Sr segregation. Furthermore, our study suggests that this Sr segregation has caused a major restructuring of the surface region characterized by the formation of a Ruddlesden-Popper phase (La,Sr)(n+1)MnnO3n+1 with n=1. Segregation and restructuring in the surface region should be common in these doped perovskites and will have a profound impact on the electronic and magnetic properties of ultrathin films and magnetic tunneling junctions made of these materials.

引用

页码：14629 / 14632

页数：4

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