Raman spectra in iron-based quaternary CeO1-xFxFeAs and LaO1-xFxFeAs

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	Raman spectra in iron-based quaternary CeO1-xFxFeAs and LaO1-xFxFeAs
	Zhao, SC ; Hou, D ; Wu, Y ; Xia, TL ; Zhang, AM ; Chen, GF ; Luo, JL ; Wang, NL ; Wei, JH ; Lu, ZY ; Zhang, QM
刊名	SUPERCONDUCTOR SCIENCE & TECHNOLOGY
	2009
卷号	22 期号:1
关键词	PHASE-DIAGRAM SUPERCONDUCTIVITY INSTABILITY COMPOUND
ISSN号	0953-2048
通讯作者	Zhao, SC (reprint author), Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China.
中文摘要	Raman spectra have been measured on iron-based quaternary CeO1-xFxFeAs and LaO1-xFxFeAs with different amounts of fluorine doping at room temperatures. A group analysis has been made to clarify the optical modes. Based on first-principle calculations, the observed phonon modes can be assigned accordingly. In LaO1-xFxFeAs, the E-g and A(1g) modes related to the vibrations of La are suppressed with increasing F doping. However, F doping only has a small effect on the Eg and A1g modes of Fe and As. The Raman modes of La and As are absent in rare-earth substituted CeO1-xFxFeAs, and the Eg mode of oxygen, corresponding to the in-plane vibration of oxygen, moves to around 450 cm(-1) and shows a very sharp peak. The electronic scattering background is low, and electron-phonon coupling is not evident for the observed phonon modes. Three features are found above 500 cm(-1), which may be associated with multi-phonon processes. Nevertheless, it is also possible that they are related to magnetic fluctuations or interband transitions of d orbitals, considering their energies.
收录类别	SCI
资助信息	MOST of China [2006CB601002, 2006CB9213001]; NSFC [10574064, 20673133]
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/51836]
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	Zhao, SC,Hou, D,Wu, Y,et al. Raman spectra in iron-based quaternary CeO1-xFxFeAs and LaO1-xFxFeAs[J]. SUPERCONDUCTOR SCIENCE & TECHNOLOGY,2009,22(1).
APA	Zhao, SC.,Hou, D.,Wu, Y.,Xia, TL.,Zhang, AM.,...&Zhang, QM.(2009).Raman spectra in iron-based quaternary CeO1-xFxFeAs and LaO1-xFxFeAs.SUPERCONDUCTOR SCIENCE & TECHNOLOGY,22(1).
MLA	Zhao, SC,et al."Raman spectra in iron-based quaternary CeO1-xFxFeAs and LaO1-xFxFeAs".SUPERCONDUCTOR SCIENCE & TECHNOLOGY 22.1(2009).