Superconductivity and Non-Metallicity Induced by Doping the Topological Insulators Bi₂Se₃ and Bi₂Te₃
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 suppresses 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 in 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 PdzBi2Te3.
Y. S. Hor et al., "Superconductivity and Non-Metallicity Induced by Doping the Topological Insulators Bi₂Se₃ and Bi₂Te₃," Journal of Physics and Chemistry of Solids, vol. 72, no. 5, pp. 572 - 576, Elsevier, May 2011.
The definitive version is available at https://doi.org/10.1016/j.jpcs.2010.10.027
Keywords and Phrases
Crystal Growth; Electric Insulators; Semiconductor Doping; Superconducting Materials; Superconductivity; Surface Properties; Transport Properties; Van Der Waals Forces; Semiconducting Selenium Compounds
International Standard Serial Number (ISSN)
Article - Journal
© 2011 Elsevier, All rights reserved.
01 May 2011