Cationic and charge segregation in La2/3Ca1/3MnO3 thin films grown on (001) and (110) SrTiO3

被引：35
作者：
Estrade, S. [1 ]
Arbiol, J. [1 ]
Peiro, F. [1 ]
Infante, I. C. [2 ]
Sanchez, F. [2 ]
Fontcuberta, J. [2 ]
de la Pena, F. [3 ]
Walls, M. [3 ]
Colliex, C. [3 ]
机构：
[1] Univ Barcelona, Dept Elect, EME, CeRMAE,IN2UB, E-08028 Barcelona, CAT, Spain
[2] CSIC, Inst Ciencia Mat Barcelona, Bellaterra 08193, CAT, Spain
[3] Univ Paris 11, CNRS, Phys Solides Lab, UMR 8502, F-91405 Orsay, France
来源：
APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 11期
关键词：
D O I：
10.1063/1.2981574
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Electron energy-loss spectroscopy is used to map composition and electronic states in epitaxial La(2/3)Ca(1/3)MnO(3) films grown on SrTiO(3) (001) and (110) substrates. It is found that in partially relaxed (110) films cationic composition and valence state of Mn(3+/4+) ions are preserved across the film thickness. In contrast, in fully strained (001) films, the Ca/La ratio gradually changes across the film, being La rich at film/substrate interface and La depleted at free surface; Mn valence state changes accordingly. These observations suggest that a strongly orientation-dependent adaptative composition mechanism dominates stress accommodation in manganite films and provides microscopic understanding of their dissimilar magnetic properties. (C) 2008 American Institute of Physics.
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