Ferromagnetism at room temperature in La{endash}Ba{endash}Ca{endash}Mn{endash}O thin films
Journal Article
·
· Journal of Applied Physics
The effects of substitution of Ca by Ba in La{sub 1{minus}x}Ca{sub x}MnO{sub 3} (LCMO) with x{lt}0.5 were investigated systematically in order to clarify the role of the size of the A cations. As for the La{sub 1{minus}x}(Ba{endash}Ca){sub x}MnO{sub 3} (LBCMO) films of ferromagnetic metallic (FMM) region (x=0.2; 0.3; and 0.4), by doping Ba, the ferromagnetic transition temperature (T{sub C}) and the insulator-to-metal (IM) transition temperature (T{sub IM}) were improved about 30{endash}60 K, compared with those of LCMO thin films with the same ratio of Mn{sup 3+}:Mn{sup 4+}. Especially, La{sub 0.7}Ba{sub 0.1}Ca{sub 0.2}MnO{sub 3} thin films have an anomalously high T{sub C} (about room temperature) and a T{sub IM} of 275 K under zero field. In the ferromagnetic insulating (FMI) region (x=0.15; 0.1), the Ba doping enables the IM transition and remarkably heightens the T{sub C} as well. The phase diagram shows that in the slightly doped region (x{lt}0.5), Ba doping has made the FMM phase significantly expanded. {copyright} 2001 American Institute of Physics.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40203931
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 11 Vol. 89; ISSN 0021-8979
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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