Strain-Induced Spin States in Atomically Ordered Cobaltites

被引：178

作者：

Choi, Woo Seok ^{[1
]}

Kwon, Ji-Hwan ^{[2
]}

Jeen, Hyoungjeen ^{[1
]}

Hamann-Borrero, Jorge E. ^{[3
,4
]}

Radi, Abdullah ^{[3
]}

Macke, Sebastian ^{[5
,6
]}

Sutarto, Ronny ^{[7
]}

He, Feizhou ^{[7
]}

Sawatzky, George A. ^{[8
]}

Hinkov, Vladimir ^{[5
]}

Kim, Miyoung ^{[2
]}

Lee, Ho Nyung ^{[1
]}

机构：

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

[2] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea

[3] Univ British Columbia, Quantum Matter Inst, Vancouver, BC V6T 1Z1, Canada

[4] IFW Dresden, Leibniz Inst Solid State & Mat Res, D-01171 Dresden, Germany

[5] Max Planck UBC Ctr Quantum Mat, Vancouver, BC V6T 1Z1, Canada

[6] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[7] Univ Saskatchewan, Canadian Light Source, Saskatoon, SK S7N 0X4, Canada

[8] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

来源：

NANO LETTERS | 2012年 / 12卷 / 09期

基金：

新加坡国家研究基金会; 加拿大自然科学与工程研究理事会;

关键词：

Perovskite cobaltites; pulsed laser epitaxy; epitaxial strain induced spin states; ferromagnetic ordering; local lattice symmetry modulation; TRANSITION; POLARIZATION; DOMAINS; LACOO3; OXYGEN;

D O I：

10.1021/nl302562f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Epitaxial strain imposed in complex oxide thin films by heteroepitaxy is recognized as a powerful tool for identifying new properties and exploring the vast potential of materials performance. A particular example is LaCoO3, a zero spin, nonmagnetic material in the bulk, whose strong ferromagnetism in a thin film remains enigmatic despite a decade of intense research. Here, we use scanning transmission electron microscopy complemented by X-ray and optical spectroscopy to study LaCoO3 epitaxial thin films under different strain states. We observed an unconventional strain relaxation behavior resulting in stripe-like, lattice modulated patterns, which did not involve uncontrolled misfit dislocations or other defects. The modulation entails the formation of ferromagnetically ordered sheets comprising intermediate or high spin Co3+, thus offering an unambiguous description for the exotic magnetism found in epitaxially strained LaCoO3 films. This observation provides a novel route to tailoring the electronic and magnetic properties of functional oxide heterostructures.

引用

页码：4966 / 4970

页数：5

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