Atomic-Resolution Imaging of Spin-State Superlattices in Nanopockets within Cobaltite Thin Films

被引：89

作者：

Gazquez, Jaume ^{[1
,2
]}

Luo, Weidong ^{[2
,3
]}

Oxley, Mark P. ^{[2
,3
]}

Prange, Micah ^{[2
,3
]}

Torija, Maria A. ^{[4
]}

Sharma, Manish ^{[4
]}

Leighton, Chris ^{[4
]}

Pantelides, Sokrates T. ^{[2
,3
]}

Pennycook, Stephen J. ^{[2
]}

Varela, Maria ^{[2
]}

机构：

[1] Univ Complutense Madrid, Dept Fis Aplicada 3, E-28040 Madrid, Spain

[2] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[3] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[4] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

来源：

NANO LETTERS | 2011年 / 11卷 / 03期

基金：

欧洲研究理事会;

关键词：

Cobaltites; spin state; O vacancies; electron energy loss spectroscopy; CRYSTAL-STRUCTURE; PEROVSKITE; TRANSITION; VALENCE; LACOO3; OXIDES;

D O I：

10.1021/nl1034896

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Certain cobalt oxides are known to exhibit ordered Co spin states, as determined from macroscopic techniques. Here we report real-space atomic-resolution imaging of Co spin-state ordering in nanopockets of La0.5Sr0.5CoO3-delta thin films. Unlike the bulk material, where no Co spin-state ordering is found, thin films present a strain-induced domain structure due to oxygen vacancy ordering, inside of which some nanometer sized domains show high-spin Co ions in the planes containing 0 vacancies and low-spin Co ions in the stoichiometric planes. First-principles calculations provide support for this interpretation.

引用

页码：973 / 976

页数：4

共 35 条

[11] Spin state transition in LaCoO3 studied using soft x-ray absorption spectroscopy and magnetic circular dichroism [J].