CAS OpenIR  > 中科院上海应用物理研究所2011-2019年
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; Wen, W; Huang, YY; Ye, M; Yang, ZQ; Qiao, S; zyang@fudan.edu.cn; qiaoshan@fudan.edu.cn
2014
Source PublicationPHYSICAL REVIEW B
ISSN1098-0121
Volume90Issue:9
AbstractTransition-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.
KeywordTotal-energy Calculations Wave Basis-set Crystal-structures Semiconductors Transition Surface Bi2te3 Phase Cuse2
Indexed BySCI
Language英语
WOS IDWOS:000341294600001
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/14223
Collection中科院上海应用物理研究所2011-2019年
Corresponding Authorzyang@fudan.edu.cn; qiaoshan@fudan.edu.cn
Recommended Citation
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).
APA Liu, Z.,Wei, XY.,Wang, JJ.,Pan, H.,Ji, FH.,...&qiaoshan@fudan.edu.cn.(2014).Local structures around 3d metal dopants in topological insulator Bi2Se3 studied by EXAFS measurements.PHYSICAL REVIEW B,90(9).
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).
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