Temperature-Dependent Raman Spectrum of Hexagonal YMnO3 Films Synthesized by Chemical Solution Method
LIU Yue-Feng1,2, WANG Bei1, ZHENG Hai-Wu1, LIU Xiang-Yang1, GU Yu-Zong1, ZHANG Wei-Feng1
1Institute of Microsystems for Physics, Key Lab for Photovoltaic Materials of Henan Province, Department of Physics, Henan University, Kaifeng 475001 2Center of Basic Experiment, Henan University, Kaifeng 475001
Temperature-Dependent Raman Spectrum of Hexagonal YMnO3 Films Synthesized by Chemical Solution Method
LIU Yue-Feng1,2, WANG Bei1, ZHENG Hai-Wu1, LIU Xiang-Yang1, GU Yu-Zong1, ZHANG Wei-Feng1
1Institute of Microsystems for Physics, Key Lab for Photovoltaic Materials of Henan Province, Department of Physics, Henan University, Kaifeng 475001 2Center of Basic Experiment, Henan University, Kaifeng 475001
摘要We study the temperature-dependent Raman spectrum of hexagonal YMnO3 films prepared by a chemical solution method. There are seven Raman peaks (3A1+E1+4E2) of the film identified at room temperature. From the results of temperature dependence of the Raman spectrum, it is deduced that the YMnO3 film has a magnetic phase transition temperature of about 123 K. The temperature variation phonon mode at 685 cm-1 shows an anomalous frequency variation near 123 K, suggesting either a more complex mechanism of spin-phonon coupling or strong mixing of phonon modes. The reason for the higher antiferromagnetic Néel temperature TN of the film than that of the bulk counterpart is also discussed.
Abstract：We study the temperature-dependent Raman spectrum of hexagonal YMnO3 films prepared by a chemical solution method. There are seven Raman peaks (3A1+E1+4E2) of the film identified at room temperature. From the results of temperature dependence of the Raman spectrum, it is deduced that the YMnO3 film has a magnetic phase transition temperature of about 123 K. The temperature variation phonon mode at 685 cm-1 shows an anomalous frequency variation near 123 K, suggesting either a more complex mechanism of spin-phonon coupling or strong mixing of phonon modes. The reason for the higher antiferromagnetic Néel temperature TN of the film than that of the bulk counterpart is also discussed.
LIU Yue-Feng;WANG Bei;ZHENG Hai-Wu;LIU Xiang-Yang;GU Yu-Zong;ZHANG Wei-Feng. Temperature-Dependent Raman Spectrum of Hexagonal YMnO3 Films Synthesized by Chemical Solution Method[J]. 中国物理快报, 2010, 27(5): 56801-056801.
LIU Yue-Feng, WANG Bei, ZHENG Hai-Wu, LIU Xiang-Yang, GU Yu-Zong, ZHANG Wei-Feng. Temperature-Dependent Raman Spectrum of Hexagonal YMnO3 Films Synthesized by Chemical Solution Method. Chin. Phys. Lett., 2010, 27(5): 56801-056801.
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2010, Vol. 27 
