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Raman study of BiFeO3 with different excitation wavelengths

qingping999_0 添加于 2010-5-31 18:46 | 1566 次阅读 | 0 个评论

作者
YANG Y, SUN J, ZHU K, LIU Y, CHEN J, XING X
摘要
Raman spectra of bismuth ferrite (BiFeO 3 ) over the frequency range of 100–1500 cm −1 have been systematically investigated with different excitation wavelengths. The intensities of the two-phonon modes are enhanced obviously under the excitation of 532 nm wavelength. This is attributed to the resonant behavior when incident laser energy closes to the intrinsic bandgap of BiFeO 3 . The Raman spectra of BiFeO 3 excited at 532 nm were measured over the temperature range from 77 to 678 K. Besides the abnormal changes of the peak position and the linewidth of the A 1 mode at 139 cm −1 , the prominent frequency shift, the line broadening and the decrease of the intensity for the two-phonon mode at 1250 cm −1 were observed as the temperature increased to Néel temperature ( T N ). All these results indicate the existence of strong spin–phonon coupling in BiFeO 3 .
详细资料
- 文献种类:期刊
- 期刊名称: Physica B: Condensed Matter
- 期刊缩写: Physica B: Condensed Matter
- 期卷页: 2009年第404卷第1期 171-174页
- ISBN: 0921-4526
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