Effect of disorder in the charge-density-wave compounds LaTe1.95 and CeTe1.95-xSex (x=0 and 0.16) as revealed by optical spectroscopy
文献类型：期刊论文
| 作者 | Huang, Y ; Hu, BF ; Dong, T ; Fang, AF ; Zheng, P ; Wang, NL |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2012 |
| 卷号 | 86期号:20 |
| ISSN号 | 1098-0121 |
| 通讯作者 | Huang, Y: Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China. |
| 中文摘要 | We present optical spectroscopy measurements on rare-earth ditelluride single crystals of LaTe1.95 and CeTe1.95-xSex (x = 0 and 0.16). The measurements reveal formation of charge-density-wave energy gaps at rather high-energy levels, for example, 2 Delta similar to 8500 cm(-1) for LaTe1.95 and 6800 cm(-1) for CeTe1.95. More strikingly, the study reveals that, different from the rare-earth tritellurides, the Te vacancies and disorder effect play a key role in the low-energy charge excitations of ditelluride systems. Although an eminent peak is observed between 800 and 1500 cm(-1) in conductivity spectra for LaTe1.95, and CeTe1.95-xSex (x = 0 and 0.16), our analysis indicates that it could not be attributed to the formation of a small energy gap, instead it could be well accounted for by the localization modified Drude model. Our study also indicates that the low-temperature optical spectroscopic features are distinctly different from a semiconducting charge-density-wave (CDW) state with entirely gapped Fermi surfaces. |
| 收录类别 | SCI |
| 资助信息 | National Science Foundation of China [10834013, 11074291]; 973 project of the Ministry of Science and Technology of China [2011CB921701, 2012CB821403] |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/36406]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Huang, Y,Hu, BF,Dong, T,et al. Effect of disorder in the charge-density-wave compounds LaTe1.95 and CeTe1.95-xSex (x=0 and 0.16) as revealed by optical spectroscopy[J]. PHYSICAL REVIEW B,2012,86(20). |
| APA | Huang, Y,Hu, BF,Dong, T,Fang, AF,Zheng, P,&Wang, NL.(2012).Effect of disorder in the charge-density-wave compounds LaTe1.95 and CeTe1.95-xSex (x=0 and 0.16) as revealed by optical spectroscopy.PHYSICAL REVIEW B,86(20). |
| MLA | Huang, Y,et al."Effect of disorder in the charge-density-wave compounds LaTe1.95 and CeTe1.95-xSex (x=0 and 0.16) as revealed by optical spectroscopy".PHYSICAL REVIEW B 86.20(2012). |
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来源：物理研究所
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