The Effect of Strain and Strain Symmetry on the Charge-Order Transition in Bi0.4Ca0.6MnO3 Films
- ORNL
The transition to a charge and orbital ordered (CO/OO) state in epitaxial manganite films is strongly influenced by lattice strain. Bi1-xCaxMnO3 is a particularly interesting material due to its high transition temperature and its relation to other Bi-based materials. Here we review its properties and show the effects of strain and strain symmetry on Bi 0.4Ca0.6MnO3 films on SrTiO3 and LaAlO3 substrates with (pseudocubic) (001) and (011) orientations. Transport and magnetization data are compared to 4-circle x-ray diffraction and high-resolution Z-contrast scanning transmission microscopy data. We observe the spontaneous formation of single-unit-cell thick, Bi-rich layers only on (001) SrTiO3 substrates and different defect structures depending on the substrate type and orientation. This shows that the details of epitaxial strain play a role not only at phase transitions, but also during the growth of these materials. Results are compared to those published for other CO/OO manganite films.
- Research Organization:
- Oak Ridge National Laboratory (ORNL)
- Sponsoring Organization:
- SC USDOE - Office of Science (SC)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 975059
- Journal Information:
- Phase Transitions: A Multinational Journal, Journal Name: Phase Transitions: A Multinational Journal Journal Issue: 7-8 Vol. 81; ISSN 0141-1594
- Country of Publication:
- United States
- Language:
- English
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