Effect of Sr Doping on Structural and Transport Properties of BiTe.

Search for doped superconducting topological insulators is of prime importance for new quantum technologies. We report on fabrication of Sr-doped Bi2Te3 single crystals. We found that Bridgman grown samples have -type conductivity in the low 1019 cm-3, high mobility of 4000 cm2V-1s-1, crystal structure independent on nominal dopant content, and no signs of superconductivity.

Superconductivity in Cu Co-Doped SrBiSe Single Crystals.

In this study, we grew Cu co-doped single crystals of a topological superconductor candidate Sr x Bi 2 Se 3 , and studied their structural and transport properties. We reveal that the addition of even as small an amount of Cu co-dopant as 0.6 atomic %, completely suppresses superconductivity in Sr x Bi 2 Se 3 .