| Bi-centric view of the isostructural phase transitions in alpha-bi2se3 and alpha-bi2te3 | |
| Zhu, Hailiang; Dong, Juncai; Li, Pengshan; Wang, Yan; Guo, Zhiying; Shan, Xuemei; Gong, Yu; An, Pengfei; Li, Xiaodong; Zhang, Jing | |
| 刊名 | Physica status solidi b-basic solid state physics
 |
| 2017-07-01 | |
| 卷号 | 254期号:7页码:7 |
| 关键词 | Bi2se3 Bi2te Charge redistribution Isostructural phase transition Pressure Structural disorder |
| ISSN号 | 0370-1972 |
| DOI | 10.1002/pssb.201700007 |
| 通讯作者 | Chen, dongliang(chendl@ihep.ac.cn) |
| 英文摘要 | Most 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. |
| WOS关键词 | SURFACE TOPOLOGICAL TRANSITION ; HIGH-PRESSURE ; THERMOELECTRIC PROPERTIES ; BI2TE3 ; SB2TE3 ; SUPERCONDUCTIVITY ; SPECTROSCOPY |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Condensed Matter |
| 语种 | 英语 |
| 出版者 | WILEY-V C H VERLAG GMBH |
| WOS记录号 | WOS:000405120300015 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2177264 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Chen, Dongliang |
| 作者单位 | Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 10049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, Hailiang,Dong, Juncai,Li, Pengshan,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):7. |
| APA | Zhu, Hailiang.,Dong, Juncai.,Li, Pengshan.,Wang, Yan.,Guo, Zhiying.,...&Chen, Dongliang.(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),7. |
| MLA | Zhu, Hailiang,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):7. |
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