| 6H-SiC的A_1(LO)拉曼峰低温温度特性研究 |
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| 引用本文： | 宋胜华,王伟,陈羿廷,杜为民.6H-SiC的A_1(LO)拉曼峰低温温度特性研究[J].光谱学与光谱分析,2009,29(8):2108-2111. |
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| 作者姓名： | 宋胜华 王伟 陈羿廷 杜为民 |
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| 作者单位： | 北京大学物理学院,北京,100871 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，国家自然科学基金 |
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| 摘 要： | 对6H-SiC单品体材料进行了从80到320 K的低温变温拉曼光谱测量,从实验得到的谱图上指认了部分6H-SiC的折叠拉曼峰,重点利用三声子模型和四声子模型分析了A1(LO)光学声子模峰位和线宽在低温下随温度的变化特性.实验发现,随着温度降低,LO声子模谱峰中心向高波数移动,线宽减小;同时发现当温度低于160 K时,无论足谱峰中心位置还是线宽的变化都趋于平缓,这是在常温和高温下观察不到的,说明在160 K以下时A1(LO)谱线线宽是由声子本身的性质决定,温度对线宽的影响几乎可忽略;理论拟合表明,四声子模型更能与实验数据相符,三次、四次非谐振动共同作用,前者是主要过程;温度越低,A1(LO)光学声子寿命越长,这是由于原子热运动的剧烈程度随温度降低而下降,声子弛豫减弱.
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| 关 键 词： | 碳化硅 拉曼光谱 低温 变温 |
| 收稿时间： | 2008/10/13 |
Low-Temperature-Dependent Raman Study on A_1(LO) Mode of 6H-SiC |
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| SONG Sheng-hua,WANG Wei,CHEN Yi-ting,DU Wei-min.Low-Temperature-Dependent Raman Study on A_1(LO) Mode of 6H-SiC[J].Spectroscopy and Spectral Analysis,2009,29(8):2108-2111. |
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| Authors: | SONG Sheng-hua WANG Wei CHEN Yi-ting DU Wei-min |
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| Institution: | SONG Sheng-hua,WANG Wei,CHEN Yi-ting,DU Wei-minSchool of Physics,Peking University,Beijing 100871,China |
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| Abstract: | Variable temperature method was lent for low temperature Raman study on bulk monocrystal 6H-SiC in the temperature range from 80 to 320 K. Some Raman folding modes of 6H-SiC were assigned in the spectrum. The peak position and line width of optical phonon A1(LO) versus temperature mainly below RT was focused on by 3-phonon and 4-phonon models. The result showed that as the temperature decreased the line width decreased,while the peak position shifted to high wave number. It was found that as the temperature... |
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| Keywords: | 6H-SiC Raman spectrum Low temperature Variable temperature method |
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