https://scholars.lib.ntu.edu.tw/handle/123456789/573704
標題: | Large positive magnetoresistance with high Hall mobility and intercalation of Fe dopants in the quenched Bi2Te3 single crystals | 作者: | Wang S.-H., Shen D., Yang T.-W., Chen I.-N., Wang C.-H., Wang L.-M. LI-MIN WANG |
關鍵字: | Crystal impurities; Hall mobility; Hole mobility; Iron; Iron metallography; Lattice constants; Lead metallography; Magnetization; Magnetoresistance; Photoelectron spectroscopy; Single crystals; Tellurium compounds; Topology; Van der Waals forces; X ray diffraction; Electrical parameter; Hall measurements; High carrier mobility; Ion intercalation; Positive magnetoresistance; Quenching temperatures; Surface magnetism; Synchrotron x rays; Bismuth compounds | 公開日期: | 2020 | 卷: | 844 | 來源出版物: | Journal of Alloys and Compounds | 摘要: | A study of Fe-ion intercalation in Bi2Te3 probed by the x-ray diffraction, magnetization, Hall measurement, and spectra of synchrotron x-ray photoemission spectroscopy is reported, in which a large positive magnetoresistance (MR) and a high carrier mobility for applications have been achieved and probed in the quenched FexBi2Te3 single crystals with x = 0.01 and 0.15. Large positive MR of ?470% with a Hall mobility of ?44000 cm2/Vs at 5 K and 6 T has been observed on a quenched Fe0.01Bi2Te3 sample with a quenching temperature Tq of 400 °C, where the electrical parameters can be tuned by Tq. Larger c-axis lattice constants and electron-dominant carriers in the quenched samples lead to the inference that the doped Fe atoms are mostly located at the intercalated van der Waals gap positions and exist as a metallic state of Fe0, which is confirmed by the synchrotron x-ray photoemission spectroscopy (XPS) spectra. Combining the x-ray diffraction, magnetization, and Hall-coefficient studies, here we pave a simple way for probing into the location of Fe dopants in Bi2Te3. In addition, novel magnetotransports of Fe-doped Bi2Te3 associated with the absence of ferromagnetism have been presented, and satisfy the scenario that the topological surface state persists without the loss of topological insulating characteristics of the linear band dispersion, and the large MR may originate from the surface magnetism, even in the presence of Fe impurities. This study also discusses the huge enhancement of Hall mobility arising from the surface Dirac electrons that are accompanied with a modified band structure in quenched Fe0.01Bi2Te3. ? 2020 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087789484&doi=10.1016%2fj.jallcom.2020.156153&partnerID=40&md5=7b59d30bb27e27dc91a38992e9225e59 https://scholars.lib.ntu.edu.tw/handle/123456789/573704 |
ISSN: | 9258388 | DOI: | 10.1016/j.jallcom.2020.156153 |
顯示於: | 物理學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。