Formation of partial energy gap below the structural phase transition and the rare-earth element-substitution effect on infrared phonons in ReFeAsO (Re=La, Nd, and Sm)

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	Formation of partial energy gap below the structural phase transition and the rare-earth element-substitution effect on infrared phonons in ReFeAsO (Re=La, Nd, and Sm)
	Dong, T ; Chen, ZG ; Yuan, RH ; Hu, BF ; Cheng, B ; Wang, NL
刊名	PHYSICAL REVIEW B
	2010
卷号	82 期号:5
关键词	LAYERED QUATERNARY COMPOUND SUPERCONDUCTIVITY
ISSN号	1098-0121
通讯作者	Dong, T: Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	Single crystals of LaFeAsO, NdFeAsO, and SmFeAsO have been prepared by means of a NaAs flux growth technique and studied by optical spectroscopy measurements. We show that the spectral features corresponding to the partial energy gaps in the spin-density-wave (SDW) state are present below the structural phase transition. This indicates that the electronic state below the structural phase transition is already very close to that in the SDW state. We also show that in-plane infrared phonon modes display systematic shifts toward high frequency upon rare-earth element Nd and Sm substitutions for La, suggesting a strong enhancement of the bonding strength. Furthermore, an asymmetric line shape of the in-plane phonon mode is observed, yielding evidence for the presence of electron-phonon coupling in Fe pnictides.
收录类别	SCI
资助信息	National Science Foundation of China; Chinese Academy of Sciences; Ministry of Science and Technology of China
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/38419]
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	Dong, T,Chen, ZG,Yuan, RH,et al. Formation of partial energy gap below the structural phase transition and the rare-earth element-substitution effect on infrared phonons in ReFeAsO (Re=La, Nd, and Sm)[J]. PHYSICAL REVIEW B,2010,82(5).
APA	Dong, T,Chen, ZG,Yuan, RH,Hu, BF,Cheng, B,&Wang, NL.(2010).Formation of partial energy gap below the structural phase transition and the rare-earth element-substitution effect on infrared phonons in ReFeAsO (Re=La, Nd, and Sm).PHYSICAL REVIEW B,82(5).
MLA	Dong, T,et al."Formation of partial energy gap below the structural phase transition and the rare-earth element-substitution effect on infrared phonons in ReFeAsO (Re=La, Nd, and Sm)".PHYSICAL REVIEW B 82.5(2010).