Surface symmetry-breaking and strain effects on orbital occupancy in transition metal perovskite epitaxial films

被引：297

作者：

Pesquera, D. ^{[1
]}

Herranz, G. ^{[1
]}

Barla, A. ^{[2
,3
]}

Pellegrin, E. ^{[2
]}

Bondino, F. ^{[4
]}

Magnano, E. ^{[4
]}

Sanchez, F. ^{[1
]}

Fontcuberta, J. ^{[1
]}

机构：

[1] Inst Ciencia Mat Barcelona ICMAB CSIC, Bellaterra 08193, Spain

[2] ALBA Synchrotron Light Source, E-08290 Barcelona, Spain

[3] ISM CNR, Ist Struttura Mat, I-34149 Trieste, Italy

[4] IOM CNR, Lab TASC, I-34149 Trieste, Italy

来源：

NATURE COMMUNICATIONS | 2012年 / 3卷

关键词：

OXIDE; INTERFACES;

D O I：

10.1038/ncomms2189

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The electron occupancy of 3d-orbitals determines the properties of transition metal oxides. This can be achieved, for example, through thin-film heterostructure engineering of ABO(3) oxides, enabling emerging properties at interfaces. Interestingly, epitaxial strain may break the degeneracy of 3d-e(g) and t(2g) orbitals, thus favoring a particular orbital filling with consequences for functional properties. Here we disclose the effects of symmetry breaking at free surfaces of ABO(3) perovskite epitaxial films and show that it can be combined with substrate-induced epitaxial strain to tailor at will the electron occupancy of in-plane and out-of-plane surface electronic orbitals. We use X-ray linear dichroism to monitor the relative contributions of surface, strain and atomic terminations to the occupancy of 3z(2)-r(2) and x(2)-y(2) orbitals in La2/3Sr1/3MnO3 films. These findings open the possibility of an active tuning of surface electronic and magnetic properties as well as chemical properties (catalytic reactivity, wettability and so on).

引用

页数：7

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