Effect of Strain on Structure and Charge Order Transitions in Epitaxial Bi0.4Ca0.6MnO3 Films on Perovskite (001) and (011) Substrates
- ORNL
The effect of epitaxial strain on the charge order (CO) transition in Bi{sub 0.4}Ca{sub 0.6}MnO{sub 3} films was studied by varying the strain's strength and symmetry via the use of SrTiO{sub 3} and LaAlO{sub 3} substrates having different crystallographic orientations. The film on pseudocubic (001) LaAlO{sub 3}, under symmetric compressive strain, exhibits a clear CO transition. In the film on a (001) SrTiO{sub 3} 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) SrTiO{sub 3} results in an apparent compressive strain state with a deviation from tetragonality (i.e., {gamma} {ne} 90{sup o}), accompanied by the sharpest CO transition. These comparisons illustrate the importance of considering both the strength and symmetry of epitaxial strain.
- Research Organization:
- Oak Ridge National Laboratory (ORNL)
- Sponsoring Organization:
- SC USDOE - Office of Science (SC)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1003580
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 20 Vol. 88; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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