Raman scattering study of La0.7Sr0.3MnO3/SrTiO3 multilayers

被引:33
作者
Kreisel, J
Lucazeau, G
Dubourdieu, C
Rosina, M
Weiss, F
机构
[1] Ecole Natl Super Phys Grenoble, Mat & Genie Phys Lab, F-38402 St Martin Dheres, France
[2] ENSEEG, Lab Electrochim & Physicochim Mat & Interfaces, F-38402 St Martin Dheres, France
[3] Slovak Acad Sci, Inst Elect Engn, Bratislava 84239, Slovakia
关键词
D O I
10.1088/0953-8984/14/20/315
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We report room-temperature Raman scattering results on perovskite-type [(La0.7Sr0.3MnO3)(m)/(SrTiO3)(n)](15) multilayers, in and n being the thicknesses of layers alternated 15 times. Distinct changes in the Raman spectra for different n and in have been analysed in the light of structural modifications and point to a tensile-strain-induced rhombohedral-to-orthorhombic phase transition in the La0.7Sr0.3MnO3 (LSMO) layers. As a matter of fact, the presented results provide anew structural basis for the earlier proposed magnetic phase separation model. The present work validates tensile strain as an important variable in thin films, which not only allows us to distort the perovskite structure within a crystallographic space group but can readily induce a transition towards another space group and its related physical properties. As shown in this study, the fabrication of superlattice materials then constitutes a powerful method to stabilize such artificial crystal structures (here artificial orthorhombic LSMO at 300 K) over a greater overall thickness than would be possible in single films.
引用
收藏
页码:5201 / 5210
页数:10
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