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Bi-centric view of the isostructural phase transitions in alpha-Bi2Se3 and alpha-Bi2Te3
Zhu HL(朱海亮); Dong JC(董俊才); Li PS(李鹏善); Wang Y(王研); Guo ZY(郭志英); Shan XM(山雪梅); Gong Y(宫宇); An PF(安鹏飞); Li XD(李晓东); Zhang J(张静); Chen DL(陈栋梁); Zhu, HL; Dong, JC; Li, PS; Wang, Y; Guo, ZY; Shan, XM; Gong, Y; An, PF; Li, XD; Zhang, J; Chen, DL
2017
Source PublicationPHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
ISSN0370-1972
EISSN1521-3951
Volume254Issue:7Pages:1700007
SubtypeArticle
AbstractMost of A(2)B(3)-type 3D topological insulators (e.g., Bi2Se3, Bi2Te3, Sb2Te3) have been reported to exhibit a pressure-induced isostructural phase transition (IPT) in the low-pressure region (<5GPa); however, the underlying mechanism is not fully understood yet. Here, we comparatively investigated the IPTs in -Bi2Se3 and -Bi2Te3 using high-pressure Bi L-3-edge X-ray absorption fine structure spectroscopy, complemented with density functional theory (DFT) calculation. Near the IPT, the slope of the Bi L-3-edge absorption energy shows a sudden decrease. In contrast to the monotonous shortening of the Bi-Bi bond-distance under compression, it is moreover rather surprising that the Bi-Se2 (Te2) and Bi-Se1 (Te1) bond-distances exhibit abnormal elongations around the IPT, which is synchronized with abrupt increases for their Debye-Waller factor. DFT calculation results show that near the IPT a structural distortion may appear for extremely small energy barrier. Those results indicate that each quintuple layer unit shrinks along the layer direction but elongates perpendicular to the layers at the onset of the IPT, which would be associated with a remarkable increase for the local structural disorder. Therefore, our findings suggest that the IPTs in -Bi2Se3 and -Bi2Te3 are coupled with a simultaneous charge redistribution and structural distortion accompanied with a static structural disorder increase. Sketch of the changes of local structure of centric Bi and lattice structure around the IPT.
KeywordBi2Se3 Bi2Te charge redistribution isostructural phase transition pressure structural disorder
DOI10.1002/pssb.201700007
WOS KeywordSURFACE TOPOLOGICAL TRANSITION ; HIGH-PRESSURE ; THERMOELECTRIC PROPERTIES ; BI2TE3 ; SB2TE3 ; SUPERCONDUCTIVITY ; SPECTROSCOPY
Indexed BySCI ; ADS
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Condensed Matter
WOS IDWOS:000405120300015
ADS Bibcode2017PSSBR.25400007Z
ADS URLhttps://ui.adsabs.harvard.edu/abs/2017PSSBR.25400007Z
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2017PSSBR.25400007Z/citations
Citation statistics
Cited Times:8 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/284918
Collection多学科研究中心
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Zhu HL,Dong JC,Li PS,et al. Bi-centric view of the isostructural phase transitions in alpha-Bi2Se3 and alpha-Bi2Te3[J]. PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS,2017,254(7):1700007.
APA 朱海亮.,董俊才.,李鹏善.,王研.,郭志英.,...&Chen, DL.(2017).Bi-centric view of the isostructural phase transitions in alpha-Bi2Se3 and alpha-Bi2Te3.PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS,254(7),1700007.
MLA 朱海亮,et al."Bi-centric view of the isostructural phase transitions in alpha-Bi2Se3 and alpha-Bi2Te3".PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS 254.7(2017):1700007.
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