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Lee, Zonghoon
Atomic-Scale Electron Microscopy (ASEM) Lab
Research Interests
  • Advanced Transmission Electron Microscopy (TEM/STEM), in Situ TEM, graphene, 2D materials, low-dimensional crystals, nanostructured materials

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Tuning of magnetic and transport properties in Bi2Te3 by divalent Fe doping

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Title
Tuning of magnetic and transport properties in Bi2Te3 by divalent Fe doping
Author
Jo, N. H.Lee, K. J.Kim, C. M.Okamoto, K.Kimura, A.Miyamoto, K.Okuda, T.Kim, Y. K.Lee, ZonghoonOnimaru, T.Takabatake, T.Jung, M. H.
Issue Date
2013-05
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.87, no.20, pp.1 - 5
Abstract
We report the doping effect of a magnetic Fe ion in Bi2Te3, that is, Bi2-xFexTe3 (x = 0, 0.08, 0.15, 0.2, 0.25, and 0.3). The paramagnetic magnetization data reveal that the Fe ions are doped in the divalent form. The Fe2+ state substituted for Bi3+ can create hole donors, which compensate for the electron dopants of Bi2Te3 with a small amount of Te excess. This causes the n-type carrier density to be decreased with increasing x, and finally be changed to p type at x = 0.3, where the carrier mobility suddenly drops and the electrical resistivity abruptly increases. These results are consistent with angle-resolved photoemission spectroscopy experiments. The Fermi level shifts downward with increasing x. Furthermore, we find a larger spin polarization for the Fe-doped Bi2Te3 samples, which is crucial for future spintronics applications.
URI
https://scholarworks.unist.ac.kr/handle/201301/2697
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84877886247
DOI
10.1103/PhysRevB.87.201105
ISSN
2469-9950
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