Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-08-04
Phys. Rev. B 70, 094407,(2004)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 6 figures
Scientific paper
10.1103/PhysRevB.70.094407
Raman spectra of LCMO films grown on LAO (001), STO (001), and MgO (001) substrates were studied at different temperatures. The effect of temperature, doping level and strain on Raman spectra are discussed in detail. With decreasing temperature, the changes of Raman spectra are correlated with the disorder-order transition, shuch as: paramagnetism to ferromagnetism, and charge-ordering. The strain induced by lattice-substrate mismatch affects the Raman spectra strongly. The mode induced by disorder of oxygen defects is apparently observed in $La_{0.67}Ca_{0.33}MnO_3$ film on STO due to the larger tensile strain. While this mode can not be seen in the Raman spectra for the films on LAO and MgO. A strong unsigned mode at about 690 $cm^{-1}$ is observed in all films except for $La_{0.67}Ca_{0.33}MnO_3$ film on LAO, which is not observed in bulk sample easily. It suggests that the mode is closely related to the strain.
Chen Hua-Xing
Chen Li-Chyong
Chen Tairong
Chen Xingming
Wang Guang-Yu
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