Local structures around 3d metal dopants in topological insulator Bi2Se3 studied by EXAFS measurements

	Local structures around 3d metal dopants in topological insulator Bi2Se3 studied by EXAFS measurements
	Liu, Z; Wei, XY; Wang, JJ; Pan, H; Ji, FH; Xi, FC; Zhang, J; Hu, TD; Zhang, S; Jiang, Z
刊名	PHYSICAL REVIEW B
	2014
卷号	90 期号:9 页码:94107
英文摘要	Transition-metal-doped Bi2Se3 crystals, X0.05Bi2Se3 (X = Cr, Co, Ni, and Cu), are prepared and studied by powder x-ray diffraction and extended x-ray absorption fine structure (EXAFS) measurements to get the local structures around the dopants. Cr atoms substitute Bi atoms and Co atoms may substitute Bi atoms or form Co3Se4 (C2/m) clusters. Cu is also found taking the Bi substitutional site, which differs from the reported superconductor phase of Cu-doped Bi2Se3, suggesting the dependence of site occupancy of Cu in Bi2Se3 on the process of sample growing. For Ni0.05Bi2Se3, Ni atoms form Ni3Se4 (C2/m) clusters. The nearest neighbors of X (X = Cr, Co, and Cu) are Se atoms, and the X-Se bond lengths are extracted from EXAFS as 2.50 angstrom for Cr-Se, 2.40 angstrom for Co-Se, and 2.38 angstrom for Cu-Se, which show the direct evidences of dramatic structural relaxations around 3d dopants. The bond information of local structures around dopants is valuable for subsequent theoretical studies, and can hardly be obtained from other techniques.
学科主题	Physics
收录类别	SCI
WOS记录号	WOS:000341294600001
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/225256]
专题	高能物理研究所_多学科研究中心
推荐引用方式 GB/T 7714	Liu, Z,Wei, XY,Wang, JJ,et al. Local structures around 3d metal dopants in topological insulator Bi2Se3 studied by EXAFS measurements[J]. PHYSICAL REVIEW B,2014,90(9):94107.
APA	Liu, Z.,Wei, XY.,Wang, JJ.,Pan, H.,Ji, FH.,...&Qiao, S.(2014).Local structures around 3d metal dopants in topological insulator Bi2Se3 studied by EXAFS measurements.PHYSICAL REVIEW B,90(9),94107.
MLA	Liu, Z,et al."Local structures around 3d metal dopants in topological insulator Bi2Se3 studied by EXAFS measurements".PHYSICAL REVIEW B 90.9(2014):94107.