| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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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 |
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| Cite this article: |
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LIU Yue-Feng, WANG Bei, ZHENG Hai-Wu et al 2010 Chin. Phys. Lett. 27 056801 |
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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.
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| Keywords:
68.49.Uv
75.50.Ee
63.20.-e
78.30.-j
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Received: 15 July 2009
Published: 23 April 2010
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