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arXiv · 1006.0317

Superconductivity and non-metallicity induced by doping the topological insulators Bi2Se3 and Bi2Te3

Y. S. Hor·J. G. Checkelsky·D. Qu·N. P. Ong·R. J. Cava
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Abstract

We show that by Ca-doping the Bi2Se3 topological insulator, the Fermi level can be fine tuned to fall inside the band gap and therefore suppress the bulk conductivity. Non-metallic Bi2Se3 crystals are obtained. On the other hand, the Bi2Se3 topological insulator can also be induced to become a bulk superconductor, with Tc ~ 3.8 K, by copper intercalation in the van der Waals gaps between the Bi2Se3 layers. Likewise, an as-grown crystal of metallic Bi2Te3 can be turned into a non-metallic crystal by slight variation of the Te content. The Bi2Te3 topological insulator shows small amounts of superconductivity with Tc ~ 5.5 K when reacted with Pd to form materials of the type PdxBi2Te3.

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Y. S. Hor, J. G. Checkelsky, D. Qu, N. P. Ong, R. J. Cava. 2010-06-02. Superconductivity and non-metallicity induced by doping the topological insulators Bi2Se3 and Bi2Te3. https://doi.org/10.1016/j.jpcs.2010.10.027

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