Effect of strain on structure and charge order transitions in epitaxial Bi 0.4Ca 0.6MnO 3 films on perovskite (001) and (011) substrates

Dae Ho Kim; Hans M. Christen; Maria Varela; Ho Nyung Lee; Douglas H. Lowndes

doi:10.1063/1.2205753

Effect of strain on structure and charge order transitions in epitaxial Bi _0.4Ca _0.6MnO ₃ films on perovskite (001) and (011) substrates

Dae Ho Kim, Hans M. Christen, Maria Varela, Ho Nyung Lee, Douglas H. Lowndes

Materials Science and Technology Div

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

The effect of epitaxial strain on the charge order (CO) transition in Bi0.4 Ca0.6 Mn O3 films was studied by varying the strain's strength and symmetry via the use of SrTi O3 and LaAl O3 substrates having different crystallographic orientations. The film on pseudocubic (001) LaAl O3, under symmetric compressive strain, exhibits a clear CO transition. In the film on a (001) SrTi O3 substrate, under symmetric tensile strain, highly segregated line-shaped features in the Bi distribution are seen in Z-contrast scanning transmission microscopy, accompanied by a strongly broadened CO transition. The asymmetric tensile stress on (011) SrTi O3 results in an apparent compressive strain state with a deviation from tetragonality (i.e., γ 90°), accompanied by the sharpest CO transition. These comparisons illustrate the importance of considering both the strength and symmetry of epitaxial strain.

Original language	English
Article number	202503
Journal	Applied Physics Letters
Volume	88
Issue number	20
DOIs	https://doi.org/10.1063/1.2205753
State	Published - May 15 2006

Funding

Research sponsored by the Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy, under Contract No. DE-AC05-00OR22725 with Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC.

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725
Basic Energy Sciences
Oak Ridge National Laboratory
Division of Materials Sciences and Engineering

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abstract = "The effect of epitaxial strain on the charge order (CO) transition in Bi0.4 Ca0.6 Mn O3 films was studied by varying the strain's strength and symmetry via the use of SrTi O3 and LaAl O3 substrates having different crystallographic orientations. The film on pseudocubic (001) LaAl O3, under symmetric compressive strain, exhibits a clear CO transition. In the film on a (001) SrTi O3 substrate, under symmetric tensile strain, highly segregated line-shaped features in the Bi distribution are seen in Z-contrast scanning transmission microscopy, accompanied by a strongly broadened CO transition. The asymmetric tensile stress on (011) SrTi O3 results in an apparent compressive strain state with a deviation from tetragonality (i.e., γ 90°), accompanied by the sharpest CO transition. These comparisons illustrate the importance of considering both the strength and symmetry of epitaxial strain.",

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AU - Kim, Dae Ho

AU - Christen, Hans M.

AU - Varela, Maria

AU - Lee, Ho Nyung

AU - Lowndes, Douglas H.

PY - 2006/5/15

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AB - The effect of epitaxial strain on the charge order (CO) transition in Bi0.4 Ca0.6 Mn O3 films was studied by varying the strain's strength and symmetry via the use of SrTi O3 and LaAl O3 substrates having different crystallographic orientations. The film on pseudocubic (001) LaAl O3, under symmetric compressive strain, exhibits a clear CO transition. In the film on a (001) SrTi O3 substrate, under symmetric tensile strain, highly segregated line-shaped features in the Bi distribution are seen in Z-contrast scanning transmission microscopy, accompanied by a strongly broadened CO transition. The asymmetric tensile stress on (011) SrTi O3 results in an apparent compressive strain state with a deviation from tetragonality (i.e., γ 90°), accompanied by the sharpest CO transition. These comparisons illustrate the importance of considering both the strength and symmetry of epitaxial strain.

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Effect of strain on structure and charge order transitions in epitaxial Bi _0.4Ca _0.6MnO ₃ films on perovskite (001) and (011) substrates

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