Electronic and Magnetic Reconstructions in La0.7Sr0.3MnO3/SrTiO3 Heterostructures: A Case of Enhanced Interlayer Coupling Controlled by the Interface

被引：83
|
作者：
Bruno, F. Y. [1 ]
Garcia-Barriocanal, J. [1 ,2 ]
Varela, M. [3 ]
Nemes, N. M. [1 ]
Thakur, P.
Cezar, J. C.
Brookes, N. B.
Rivera-Calzada, A. [1 ]
Garcia-Hernandez, M. [4 ]
Leon, C. [1 ]
Okamoto, S. [3 ]
Pennycook, S. J. [3 ]
Santamaria, J. [1 ]
机构：
[1] Univ Complutense Madrid, GFMC, Dept Fis Aplicada 3, E-28040 Madrid, Spain
[2] European Synchrotron Radiat Facil, SpLine Spanish CRG Beamline, F-38043 Grenoble, France
[3] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
[4] Consejo Super Invest Cient, Inst Ciencia Mat Madrid, Canto Blanco 28049, Spain
来源：
PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 14期
关键词：
OXIDES;
D O I：
10.1103/PhysRevLett.106.147205
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report on the magnetic coupling of La0.7Sr0.3MnO3 layers through SrTiO3 spacers in La0.7Sr0.3MnO3/SrTiO3 epitaxial heterostructures. Combined aberration-corrected microscopy and electron-energy-loss spectroscopy evidence charge transfer to the empty conduction band of the titanate. Ti d electrons interact via superexchange with Mn, giving rise to a Ti magnetic moment as demonstrated by x-ray magnetic circular dichroism. This induced magnetic moment in the SrTiO3 controls the bulk magnetic and transport properties of the superlattices when the titanate layer thickness is below 1 nm.
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页数：4
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